case study questions class 10 magnetic effect of electric current

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Case Study Questions Class 10 Science Magnetic Effects of Electric Current

Case study questions class 10 science chapter 13 magnetic effects of electric current.

CBSE Class 10 Case Study Questions Science Magnetic Effects of Electric Current. Term 2 Important Case Study Questions for Class 10 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Magnetic Effects of Electric Current.

At Case Study Questions there will given a Paragraph. In where some Important Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks, 4 marks.

CBSE Case Study Questions Class 10 Science Magnetic Effects of Electric Current

Case Study – 1

Andre Marie Ampere suggested that a magnet must exert an equal and opposite force on a current carrying conductor, which was experimentally found to be true. But we know that current is due to charges in motion. Thus, it is clear that a charge moving in a magnetic field experience a force, except when it is moving in a direction parallel to it. If the direction of motion is perpendicular to the direction of magnetic field, the magnitude of force experienced depends on the charge, velocity (v) , strength of magnetic field(B), and sine of the angle between v and B.

(a) Direction of magnetic force is given by which rule?

Answer- Fleming’s left hand rule.

(b) Write the statement of the rule?

Answer- It states that if we stretch thumb, forefinger or the index finger and the middle finger in such a way that they are mutually perpendicular to each other then the thumb gives the direction of the motion or the force acting on conductor, index finger gives the direction of magnetic field and the middle finger gives the direction of current.

Case Study – 2

Two coils C1 and C2 are wrapped around a non-conducting cylinder. Coil C1 is connected to a battery and key and C2 with galvanometer G. On pressing the key (K), current starts flowing in the coil C1.

case study questions class 10 magnetic effect of electric current

State your observation in the galvanometer.

(a) When key K is pressed on.
(b) When current in the coil C1 is switched off.
(c) When the current is passed continuously through coil C1 .
(d) Name and state the phenomenon responsible for the above observation.

a.) The galvanometer needle deflects momentarily in one direction.

b.) The galvanometer needle deflects again momentarily but in opposite direction to that in the previous case.

c.) No deflection.

d) Electromagnetic induction.

Explanation- Electromagnetic induction is a process by changing a magnetic field in a conductor, which induces a current in another conductor placed in nearby.

Case Study – 3

It is well known that “magnetic field is caused by electric current. ”Whenever there is a change in magnetic flux linked with a coil (or circuit) an emf is induced in the coil. This phenomenon is called electromagnetic induction. The emf produced in the coil is called the induced emf.If the coil is closed, the current thus produced is called as induced current. The direction of induced current is determining by Fleming’s right hand rule. These induced current are used in a moving coil microphone, tape-recorders, video recorders, hard-discs in computers etc.

Based on the above information, answer the following questions

(a) State Faraday’s law of electromagnetic induction.

Ans – When we linked magnetic field lines with a coil due to relative motion of a magent and the coil, then an induced current produced in the coil. The magnet of induced current is directly proportional. The rate of change of number of magnetic field lines to the coil.

(b) State any two methods of inducing current in a coil.

Answer- Current can be induced in a coil by

Rotating a coil within a magnetic field.
Moving a coil towards or away from a magnet
Moving a magnet towards or away from the coil

Case Study – 4

A student connects a coil of wire with a sensitive galvanometer as shown in figure. Where should the bar magnet be placed to cause the deflection in the galvanometer.

Answer- The bar magnet should be moved towards or away from the coil and parallel to the axis of the coil.

Case study: 4

As the magnitude of magnetic field depends on the current through it. Also, if the number of turns of wire in a circuit is more then also the magnitude of magnetic field is more. If a coil having many circular turns of insulated copper wire wound closely to form a cylindrical shape is called as solenoid. Solenoid is used to produce strong magnetic field which can be used to magnetise the piece of magnetic material. And hence they are used in making electromagnet mainly.

1) What is the nature of magnetic field lines inside the solenoid?

2) For what right hand thumb rule is used?

3) What are the properties of magnetic poles?

1) Inside the solenoid the magnetic field lines are parallel straight lines and the magnetic field inside the solenoid is uniform.

2) The right hand thumb rule is used to find the direction of electric current which given by the thumb.

3) The like poles of a magnet repels each other and the unlike poles of magnet attract each other.

Case study: 5

Electric motor is used to convert electric energy into mechanical energy. It is mostly used in electric fans, refrigerators, mixers, washing machine, computers etc.

The commercial motor uses an electromagnet in place of permanent magnet, large number of turns of the conducting wire in the current carrying coil, a soft iron core on which the coil is wound. If we stretched the thumb, forefinger and middle finger of right hand so that they are mutually perpendicular to each other. If the forefinger gives the direction of magnetic field and thumb gives the direction of motion of conductor then the middle finger gives the direction of induced current. And this rule is called as Fleming’s right hand rule.

Electric generator is used to convert mechanical energy into electrical energy.The direct current always flows in one direction while the alternating current changes its direction periodically. The frequency of AC in India is 50 Hz.

1) Which is the important advantage of AC over DC?

2) Electric generator works on the phenomenon of?

3) Fleming’s right hand rule is used for ?

4) The phenomenon of electromagnetic induction was discovered by?

1) The important advantage of AC over DC is that electric power can be transmitted over long distances without more loss of energy.

2) Electric generator is based on the phenomenon of electromagnetic induction.

3) Fleming’s right hand rule is used to find the direction of induced current.

4) The phenomenon of electromagnetic induction was discovered by Michael Faraday.

Case study: 6

The domestic electric circuit consist of red insulated cover called as live wire, wire with black insulation called as neutral wire and the wire with green insulation is called as Earth wire. We know that fuse is connected in series with the circuit to prevent the damaging of electrical appliances and circuit from overloading. Overloading occurs when live wire and the neutral wire comes in direct contact with each other. Because of which current through the circuit increases suddenly. Also, overloading may occurs because of connecting many appliances to a single socket. The Earth wire which is green in colour is connected to a metal plate deep in the earth near the house. This type of safety measure is used in appliances like electric press, toaster, table fan, refrigerator etc. The Earth wire is gives low resistance conducting path for the electric current. In this way it protects us from severe electric shock.

All the appliances are connected in parallel circuit so that the potential difference across each appliance will be same.

1) What are the signs of live wire and neutral wire?

2) In our country what is the potential difference between live wire and neutral wire?

3) What is short circuiting?

4) What is the main purpose of using fuse in electric circuit?

1) The red insulated wire is the live wire or positive and the black insulated wire is the neutral wire or negative.

2) In our country the potential difference between live wire and neutral wire is 220 V.

3) When live wire and neutral wire comes in direct contact, in that situation the current through the circuit increases suddenly and it is called as short circuiting.

4) Because of Joule’s heating effect the heat produced causes the fuse to melt and to break the circuit. And thereby protect the circuit and electric appliances.

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Case Study Questions Class 10 Science Chapter 13 Magnetic Effects of Electric Current

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Case study Questions Class 10 Science Chapter 13 are very important to solve for your exam. Class 10 Science Chapter 13 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving case study-based questions for Class 10 Science Chapter 13 Magnetic Effects of Electric Current

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In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Reason . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Magnetic Effects of Electric Current Case Study Questions With answers

Here, we have provided case-based/passage-based questions for Class 10 Science Chapter 13 Magnetic Effects of Electric Current

Case Study/Passage Based Questions

Question 1:

An electric motor is a rotating device that converts electrical energy into mechanical energy electric motors are used as an important component in electric fans, refrigerators, mixer, washing machines, computers, MP3 players etc. Motor Works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it, a force acts on the coil which rotates it continuously. When the coil rotates the shaft attached to it also rotates. In this way the electrical energy supplied to the motor is converted into the mechanical energy of rotation.

1.1) When the current is switched on, an electric fan converts : (a) electrical energy into mechanical energy (b) chemical energy into mechanical energy (c) electrical energy into mechanical energy (d) mechanical energy into electrical energy

Answer: (c) electrical energy into mechanical energy

1.2) In an electric motor, the direction of current in the coil changes once in each (a) two rotations (b) one rotation (c) half rotation (d) one-fourth rotation

Answer: (c) half rotation

1.3) An electron beam enters a magnetic field at right angles to it. The direction of force acting on the electron beam will be : (a) to the right (b) to the left (c) into the page (d) out of the page

Answer: (c) into the page

1.4) A magnetic field exerts no force on : (a) an unmagnetised iron bar (b) a stationary electric charge (c) a magnet (d) an electric charge moving perpendicular to its direction

Answer: (b) a stationary electric charge

1.5) Which of the following has no effect on the size of the turning effect on the coil of an electric motor? (a) The amount of the current in the coil. (b) The number of turns in the coil. (c) The direction of the current in the coil. (d) The strength of the magnetic field.

Answer: (c) The direction of the current in the coil

Question 2:

An insulated copper wire wound on a cylindrical cardboard tube such that its length is greater than its diameter is called a solenoid. When an electric current is passed through the solenoid, it produces a magnetic field around it. The magnetic field produced by a current-carrying solenoid is similar to the magnetic field produced by a bar magnet. The field lines inside the solenoid are in the form of parallel straight lines. The strong magnetic field produced inside a current-carrying solenoid can be used to magnetize a piece of a magnetic material like soft iron when placed inside the solenoid. The strength of the magnetic field produced by a current-carrying solenoid is directly proportional to the number of turns and strength of the current in the solenoid.

(i) The strength of magnetic field inside a long current-carrying straight solenoid is (a) more at the ends than at the centre (b) minimum in the middle (c) same at all points (d) found to increase from one end to the other.

Answer: (c) same at all points

(ii) The north-south polarities of an electromagnet can be found easily by using

Answer: (c) Clock face rule

(iii) For a current in a long straight solenoid N-and S-poles are created at the two ends. Among the following statements, the incorrect statement is (a) The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid. (b) The strong magnetic field produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron, when placed inside the coil. (c) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet. (d) The N- and S-poles exchange position when the direction of current through the solenoid is reversed.

Answer: (c) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet.

(iv) A long solenoid carrying a current produces a magnetic field B along its axis. If the current is double and the number of turns per cm is halved, then new value of magnetic field is

Answer: (a) B

Answer: (a) N-pole

Question 3:

(i) Choose incorrect statement from the following regarding split rings. (a) Split rings are used to reverse the direction of current in coil. (b) Split rings are also known as commutator. (c) Split ring ii a discontinuous or a broken ring. (d) Both (a) and (b)

Answer: (d) Both (a) and (b)

(ii) Which of the following has no effect on the size of the turning effect on the coil of an electric motor?

Answer: (b) The direction of the current in the coil.

(iii) When current is switched ON, an electric fan converts

Answer: (b) electrical energy to mechanical energy

(iv) In an electric motor, device that makes contact with the rotating rings and through them to supply current to coil is

Answer:(b) brushes

(v) In an electric motor, the direction of current in the coil changes once in each

Answer:(c) half rotation

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Case Study Chapter 13 Magnetic Effect of Electric Current

Please refer to Chapter 13 Magnetic Effect Of Electric Current Case Study Questions with answers provided below. We have provided Case Study Questions for Class 10 Science for all chapters as per CBSE, NCERT and KVS examination guidelines. These case based questions are expected to come in your exams this year. Please practise these case study based Class 10 Science Questions and answers to get more marks in examinations.

Case Study Questions Chapter 13 Magnetic Effect Of Electric Current

Case/Passage – 1 A solenoid is a long helical coil of wire through which a current is run in order to create a magnetic field. The magnetic field of the solenoid is the superposition of the fields due to the current through each coil. It is nearly uniform inside the solenoid and close to zero outside and is similar to the field of a bar magnet having a north pole at one end and a south pole at the other depending upon the direction of current flow. The magnetic field produced in the solenoid is dependent on a few factors such as, the current in the coil, number of turns per unit length etc. The following graph is obtained by a researcher while doing an experiment to see the variation of the magnetic fieldwith respect to the current in the solenoid. The unit of magnetic field as given in the graph attached is in milli-Tesla (mT) and the current is given in Ampere.

Case Study Chapter 13 Magnetic Effect of Electric Current

Question: What will happen if a soft iron bar is placed inside the solenoid? (a) The bar will be electrocuted resulting in shortcircuit. (b) The bar will be magnetised as long as there is current in the circuit. (c) The bar will be magnetised permanently. (d) The bar will not be affected by any means.

Question: From the graph deduce which of the following statements is correct. (a) For a current of 0.8A the magnetic field is 13 mT (b) For larger currents, the magnetic field increases nonlinearly. (c) For a current of 0.8A the magnetic field is 1.3 mT (d) There is not enough information to find the magnetic field corresponding to 0.8A current.

Question: The magnetic field lines produced inside the solenoid are similar to that of … (a) a bar magnet 10 (b) a straight current carrying conductor (c) a circular current carrying loop (d) electromagnet of any shape

Question: What type of energy conversion is observed in a linear solenoid? (a) Mechanical to Magnetic (b) Electrical to Magnetic (c) Electrical to Mechanical (d) Magnetic to Mechanical

Question: After analysing the graph a student writes the following statements. I. The magnetic field produced by the solenoid is inversely proportional to the current. II. The magnetic field produced by the solenoid is directly proportional to the current. III. The magnetic field produced by the solenoid is directly proportional to square of the current. IV. The magnetic field produced by the solenoid is independent of the current. Choose from the following which of the following would be the correct statement(s). (a) Only IV (b) I and III and IV (c) I and II (d) Only II

Case/Passage – 2 For a conductor of length L carrying a current of I in a field B the force experienced by the conductor F → = I L → x → B If the current-carrying conductor in the form of a loop of any arbitrary shape is placed in a uniform field, then, F → =0 i.e., the net magnetic force on a current loop in a uniform magnetic field is always zero. Here it must be kept in mind that in this situation different parts of the loop may experience elemental force due to which the loop may be under tension or may experience a torque. Direction of force can be determined by fleming’s left hand rule, right hand palm rule or screw rule.

Question: An electron moving with uniform velocity in x-direction enters a region of uniform magnetic field along y-direction. Which of the following physical quantity(ies) is (are) non-zero and remain constant?

I. Velocity of the electron II. Magnitude of the momentum of the electron. III. Force on the electron. IV. The kinetic energy of electron. (a) Only I andII. (b) Only III and IV. (c) All four (d) Only II and IV.

Question: A wire is lying horizontally in the north-south direction and there is a horizontal magnetic field pointing towards and the east. Some positive charges in the wire move north and an equal number of negative charges move south. The direction of force on the wire will be

(a) east (b) down, into the page (c) up, out of the page (d) west

Question: Which of the following can produce a magnetic field? (a) Electric charges at rest (b) Electric charges in motion (c) Only by permanent magnets (d) Electric charges whether at rest or in motion

Question: The direction of induced current is obtained by (a) Fleming’s left hand rule (b) Maxwell’s cork-screw rule (c) Ampere’s rule (d) Fleming’s right hand rule

Question: Four situations are given below- I. An infinitely long wire carrying current II. A rectangular loop carrying current III. A solenoid of finite length carrying current IV. A circular loop carrying current. In which of the above cases will the magnetic field produced be like that of a bar magnet? (a) I (b) I and III (c) Only III (d) Only IV

Case/Passage – 3

The strength of the magnetic field produced by a currentcarrying circular coil (or circular wire) depends on (i) Current flowing through the coil. (ii) Radius of the circular coil. (iii) Number of turns of wire in the circular coil.

Question: What type of curve we get, between magnetic field and distance along the axis of a current carrying circular coil? (a) Straight (b) Circular (c) Parabolic (d) None of these

Question:A long horizontal power line is carrying a current of 100 A in the east-west direction. The direction of magnetic field at a point 1.0 m below it is (a) south to north (b) north to south (c) east to west (d) west to east

Question: If a current carrying straight conductor is placed is east-west direction, then the direction of the force experienced by the conductor due to earth’s magnetic field is: (a) downward (b) upward (c) east-west (d) west east

Case/Passage – 4

Study this table related to wattage of home appliances and answer the questions that follow.

Question. Which of the following will to consume least power? (a) Laptop (b) Desktop (c) Printer (d) Blender

Question. Many appliance works on the principle of electromagnetic induction. The role which depicts the direction of induced current is as (a) Faraday’s rule (b) Henery’s rule (c) Fleming’s rule (d) Maxwell’s rule

Question. Which of the following home applicance is not based on magnetic effect of current? (a) Ceiling fan (b) Blender (c) Geyser (d) Washing Machine

Question. Which of the following will consume maximum power? (a) Fridge (b) Iron (c) Air conditioner (d) Coffee maker

Question. Which of the following lighting device is best to use in terms of power consumption? (a) Bulb (b) CFL (c) Tube light (d) LED

Case/Passage – 5

A magnetic stripe card, also referred to as a swipe card or magstripe, is a plastic card with a magnetic strip attached on its surface. This stripe is made of tiny iron-based components whose magnetism can be modified and can therefore be used to store information. A magstripe is quite similar to a magnetic recording tape, which you might find in videotape or a music cassette. The magnetic strip on a card can be ‘written’ or encoded with information because the tiny iron-based particles that make up the strip can be magnetised in different directions by a device that produces a strong magnetic field. This device is a ‘solenoid’, which is basically a coil wound into a tightly packed helix. The wire is wound around a highpermeable, metallic core that produces a strong magnetic field when a current is passed through it. This device encodes the required information onto the stripe, which is then pasted on a plastic card. When a card with a magnetic strip is moved back and forth over the ‘reader head’ , a voltage is induced in the coils of the card reader device. A card reader consists of solenoid too – the same component that is used to write information in the magnetic strip. This voltage can be amplified and recorded electronically, which is finally read by a computer (or a processor installed within the reader) to authenticate a user (in the case of identity cards) or a transaction (in the case of credit/debit cards).

Question. The force on a wire inside a magnetic field increase when (a) The current is increased (b) Strength of magnetic field increases (c) Length of wire is increased (d) All of above

Question. The factors on which one magnetic field strength produced by current carrying solenoids depends are (a) Magnitude of current (b) Number of turns (c) Heat produced (d) Both (a) and (b)

Question. Which of the following are the devices that uses magnetic theory to record data (a) The hotel key cards (b) Audio tapes (c) CD’s (d) All of the above

Question. The information of users which are read by the ATM machines are stored on (a) Magnetic box on card (b) Magnetic strip on card (c) Inside ATM machine (d) None of above

Question. Name the scientist who gave the principle of electromagnetic field (a) Oersted (b) Faraday (c) Bohr (d) Ampere

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Class 10 Science Chapter 12 Case Based Questions - Magnetic Effects of Electric Current

Case study - 1.

Q1: What are the signs of live wire and neutral wire? Ans: The red insulated wire is the live wire or positive and the black insulated wire is the neutral wire or negative. Q2: In our country what is the potential difference between live wire and neutral wire? Ans: In our country the potential difference between live wire and neutral wire is 220 V. Q3: What is short circuiting? Ans: When live wire and neutral wire comes in direct contact, in that situation the current through the circuit increases suddenly and it is called as short circuiting. Q4: What is the main purpose of using fuse in electric circuit? Ans: Because of Joule’s heating effect the heat produced causes the fuse to melt and to break the circuit. And thereby protect the circuit and electric appliances.

Case study - 2

If we stretched the thumb, forefinger and middle finger of our left hand so that they are mutually perpendicular to each other. If the forefinger gives the direction of magnetic field and middle finger gives the direction of electric current then the thumb gives the direction of motion or the force acting on the conductor. Electric motor is used to convert electric energy into mechanical energy. It is mostly used in electric fans, refrigerators, mixers, washing machine, computers etc. The commercial motor uses an electromagnet in place of permanent magnet, large number of turns of the conducting wire in the current carrying coil, a soft iron core on which the coil is wound. If we stretched the thumb, forefinger and middle finger of right hand so that they are mutually perpendicular to each other. If the forefinger gives the direction of magnetic field and thumb gives the direction of motion of conductor then the middle finger gives the direction of induced current. And this rule is called as Fleming’s right hand rule. Electric generator is used to convert mechanical energy into electrical energy.The direct current always flows in one direction while the alternating current changes its direction periodically. The frequency of AC in India is 50 Hz.

Q1: Which is the important advantage of AC over DC? Ans: The important advantage of AC over DC is that electric power can be transmitted over long distances without more loss of energy.

Q2: Electric generator works on the phenomenon of? Ans: Electric generator is based on the phenomenon of electromagnetic induction. Q3: Fleming’s right hand rule is used for? Ans: Fleming’s right hand rule is used to find the direction of induced current. Q4: The phenomenon of electromagnetic induction was discovered by? Ans: The phenomenon of electromagnetic induction was discovered by Michael Faraday.

Case study - 3

The change in electric current through the circuit produces magnetic field around it. Magnetic field is a vector quantity which has both magnitude as well as direction. The magnetic field lines produced are directed from north pole and ends at south pole. These lines are closed curves from which strength of the magnetic field is determined. Where magnetic field lines are crowded magnetic field is stronger and where very apart the strength of magnetic field is weak. So, we can say that as the current through the electrical circuit increase then the magnitude of magnetic field also increases. If a current carrying conductor is holded in right hand by curling figures around it. Then, the curled figures gives the direction of electric current and curled figures gives the direction of magnetic field. As the magnitude of magnetic field depends on the current through it. Also, if the number of turns of wire in a circuit is more then also the magnitude of magnetic field is more. If a coil having many circular turns of insulated copper wire wound closely to form a cylindrical shape is called as solenoid. Solenoid is used to produce strong magnetic field which can be used to magnetise the piece of magnetic material. And hence they are used in making electromagnet mainly.

Q1: What is the nature of magnetic field lines inside the solenoid? Ans: Inside the solenoid the magnetic field lines are parallel straight lines and the magnetic field inside the solenoid is uniform. Q2: For what right hand thumb rule is used? Ans: The right hand thumb rule is used to find the direction of electric current which given by the thumb. Q3: What are the properties of magnetic poles? Ans: The like poles of a magnet repels each other and the unlike poles of magnet attract each other.

Case Study – 4

It is well known that “magnetic field is caused by electric current. ”Whenever there is a change in magnetic flux linked with a coil (or circuit) an emf is induced in the coil. This phenomenon is called electromagnetic induction. The emf produced in the coil is called the induced emf. If the coil is closed, the current thus produced is called as induced current. The direction of induced current is determining by Fleming’s right hand rule. These induced current are used in a moving coil microphone, tape-recorders, video recorders, hard-discs in computers etc.

Based on the above information, answer the following questions Q1: State Faraday’s law of electromagnetic induction. Ans: When we linked magnetic field lines with a coil due to relative motion of a magent and the coil, then an induced current produced in the coil. The magnet of induced current is directly proportional. The rate of change of number of magnetic field lines to the coil. Q2: State any two methods of inducing current in a coil. Ans: Current can be induced in a coil by

Rotating a coil within a magnetic field.
Moving a coil towards or away from a magnet
Moving a magnet towards or away from the coil

Case Study – 5

Q1: Direction of magnetic force is given by which rule? Ans: Fleming’s left hand rule. Q2: Write the statement of the rule? Ans: It states that if we stretch thumb, forefinger or the index finger and the middle finger in such a way that they are mutually perpendicular to each other then the thumb gives the direction of the motion or the force acting on conductor, index finger gives the direction of magnetic field and the middle finger gives the direction of current.

Case Study – 6

Two coils C1 and C2 are wrapped around a non-conducting cylinder. Coil C1 is connected to a battery and key and C2 with galvanometer G. On pressing the key (K), current starts flowing in the coil C1.

Class 10 Science Chapter 12 Case Based Questions - Magnetic Effects of Electric Current

State your observation in the galvanometer. Q1: When key K is pressed on. Ans: The galvanometer needle deflects momentarily in one direction.

Q2: When current in the coil C1 is switched off. Ans: The galvanometer needle deflects again momentarily but in opposite direction to that in the previous case.

Q3: When the current is passed continuously through coil C1. Ans: No deflection.

(d) Name and state the phenomenon responsible for the above observation. Ans: Electromagnetic induction. Explanation: Electromagnetic induction is a process by changing a magnetic field in a conductor, which induces a current in another conductor placed in nearby.

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Magnetic Effects of Electric Current Case Study Based Questions Class 10

Students who are studying in CBSE class 10 board, need to get the knowledge about the Magnetic Effects of Electric Current Case Study Based Questions. Case based questions are generally based on the seen passages from the chapter Magnetic Effects of Electric Current. Through solving the case based questions, students can understand each and every concept.

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Important Questions for CBSE Class 10 Science Chapter 13 - Magnetic Effects of Electric Current 2024-25

CBSE Class 10 Science Chapter-13 Important Questions with Answers - Free PDF Download

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CBSE Class 10 Science Chapter 13 Magnetic Effects of Electric Current Important Questions - Free PDF Available

Very Short Answer Questions (1 Mark)

1. Magnetic field lines determine

The shape of magnetic field

Only the direction of magnetic field

Only the relative strength of the magnetic field

Both the direction and the relative strength of magnetic field

Ans: (d) Both the direction and the relative strength of magnetic field

2. A device for producing electric current is called a

Galvanometer

Ans: (c) Generator

3. At the time of short circuit, the current in the circuit

vary continuously

reduced considerably

increases heavily

does not change

Ans: (c) increases heavily

4. Figure shows the magnetic field lines between the two faces A and B of two magnets.

Both faces A and B of two bar magnets are North pole.

Both faces A and B of two bar magnets are South pole.

Face A is south pole while face B is north pole.

None of the above.

Ans: (d) None of the above.

5. The magnetic field near a long straight wire is described by

Straight field lines parallel to the wire.

Straight field lines perpendicular to the wire.

Connective circle centred on the wire.

Radial field lines starting from the wire.

Ans: (c) Connective circle centred on the wire.

6. A current carrying conductor placed in magnetic field experiences a force. The displacement of the conductor in magnetic field can be increased by

Decreasing the magnetic field.

Decreasing the current in the conductor.

Increasing the magnetic field.

Ans: (c) Increasing the magnetic field.

7. A positively charged particle say an alpha particle projected towards west is deflected toward north by a magnetic field. The direction of the magnetic field is

towards south

towards east

Ans: (a) upward

8. Which of the following properties of a proton can change when it moves freely in a magnetic field?

Ans: (c) velocity and (d) momentum

9. The direction of the magnetic field at a point P above the wire carrying current as shown in the figure is

down the page

up the page

into the page

out of the page

Ans: (d) out of the page

10. Concentric circles with arrows centred at the wire AB are shown in figure.

no current in AB

current flows from B to A

current – flows from A to B

none of these

Ans: (b) current flows from B to A

11. Electric motor converts

Mechanical energy into electrical energy

Mechanical energy into heat energy

Electrical energy into heat energy

Electrical energy into mechanical energy

Ans: (d) Electrical energy into mechanical energy

12. Potential difference between a live wire and a neutral wire is

Ans: (d) 220 volt.

13. The most important safety device method used for protecting electrical appliances from short circuiting or overloading is

use of stabilizer

use of electric meter

Ans: (d) fuse

14. Forces acting on a stationary charge of in the magnetic field B is

Ans: (d) zero

15. The rectangular coil of copper wires is rotated in a magnetic field. The direction of induced current change once in each

one revolution

one fourth revolution

half revolution

two revolutions

Ans: (c) half revolution

16. Choose the correct option:

The magnetic field inside a long straight solenoid-carrying current is zero.

Decrease as we move towards its end.

Increase as we move towards it end.

Is the same all points.

Ans: (d) Is the same at all points.

17. Name some sources of direct current.

Ans: A cell, a battery, and a D.C. generator are all examples of direct current sources.

18. The phenomenon of electromagnetic induction is

the process of charging a body.

the process of generating magnetic field due to a current passing through a coil.

producing induced current in a coil due to relative motion between a magnet and the coil.

the process of rotating a coil at an electric motor.

Ans: (c) producing induced current in a coil due to relative motion between a magnet and the coil.

19. The essential difference between A.C. generator and a D.C. generator is that

A.C. generator has an electromagnet while a D.C. generator has permanent magnet.

D.C. generator will generate a higher voltage

A.C. generator will generate a higher voltage

A.C. generator has slip rings while the D.C. generator has commentator.

Ans: (d) A.C. generator has slip rings while the D.C. generator has commentator.

20. In which position the force on conductor is maximum when it uniform magnetic field? is placed in

Ans: When the conductor is parallel to the field

21. How can it be shown that magnetic field exist around a wire carrying current?

Ans: By using a magnetic compass that displays deflection.

22. How can a solenoid be used to magnet a steel bar?

Ans: By placing a steel bar into the solenoid and turning on the electricity.

23. Why can’t two magnetic field lines ever intersect?

Ans: If this is the case, there will be two separate magnetic field directions at the site of intersection, which is not feasible.

24. Can 5A fuse be used in wire carrying 15 A current? Why?

Ans: Because they'd both be useless at managing the quantity of current flowing if that happened.

25. Give the factors that affect strength of magnetic field at a point due to a straight conductor carrying current.

Ans: Perpendicular distance between that point and the conductor, magnitude of electric content.

26. Where do we connect a fuse: with live wire or with neutral wire?

Ans: It is always wired with live electricity.

27. Name any two devices which use permanent magnets.

Ans: Loudspeaker, Motor, Galvanometer, voltmeter.

28. Draw the magnetic field lines representing uniform magnetic field.

29. If the frequency of A.C. is 50 Hz. Then how many times it is changing its direction in 1 second

Ans: 100 Times will be changing its direction in a second.

30. What is the pattern of the magnetic field lines around a straight conductor carrying current?

Ans: Concentric circles

31. If the current is flowing in the direction of advancement of screw, then what is the direction of magnetic field lines?

Ans: Magnetic field will be directed inwards .

32. How can you say that the magnetic field is uniform inside the solenoid?

Ans: Because the field lines inside the solenoid are parallel.

33. Which property of a proton will change while it moves freely in a magnetic field?

Ans: Momentum or Velocity.

34. According to Flemings right hand rule, which part of right hand indicate the movement of conductor?

35. If the no. of turns of a circular current carrying coil are doubled, then how will the magnetic field produced by it changes?

Ans: Doubled

Short Answer Questions (2 Marks)

1. State two properties of magnetic lines of force?

Ans: The two properties of magnetic lines of force are-

i. The strength of the magnetic field is proportional to the closeness of the lines.

ii. They can never cross i.e. the field is unique at any point in space.

2. Why does a compass needle deflect when brought near a bar magnet?

Ans: A compass needle deflected when brought near a bar magnet due to the magnetic field of the bar magnet.

3. The magnetic field lines in a given region are uniform. Draw a diagram to represent.

Ans: The magnetic field lines in a given region are uniform when they are represented in the same direction.

4. Write two ways to induce current in a coil?

Ans: The two ways to induce current in a coil are-

i. By moving a bar magnet toward or away from the coil current is induced.

ii. By moving a coil rapidly between the two poles of a horseshoe magnet.

5. Draw magnetic field lines around a bar magnet? Give one point of difference between uniform and non- uniform magnetic field.

Ans: The magnetic field lines around a bar magnet is as follows:

Uniform magnetic field lines are parallel but non- uniform magnetic field lines are non-parallel.

6. Why do not two magnetic field lines intersect each other?

Ans: If two magnetic field lines intersect each other then there will be two directions of magnetic field, which is not possible. Thus, they do not intersect each other.

7. Name and state rule used to determine the direction of magnetic field produced around a straight conductor carrying current?

Ans: Right hand thumb rule is used to determine the direction of magnetic field produced around a straight conductor carrying current. It states that if we hold the current-carrying conductor in our right hand such that the thumb points the direction of the current, then the direction in which the fingers encircle, gives the direction of magnetic lines.

8. What is electric fuse? Where is it connected in a circuit?

Ans: Electric fuse is a safety device which is used to limit the current in an electric circuit which is made up of a wire made of copper or aluminium or a tin lead alloy. It is always connected in series at the beginning of the circuit.

9. State the factors on which strength of magnetic field at a point due to a current carrying conductor depends?

Ans: The factors on which strength of magnetic field at a point due to a current carrying conductor depends are-

i. It is directly proportional to the amount of current (I) flowing through the conductor.

ii. It is inversely proportional to the distance (r) from the current carrying conductor.

10. What is an electromagnet? Write two uses of an electromagnet?

Ans: They are the type of magnet in which the magnetic field is produced by an electric current i.e. when current is passed through a solenoid it behaves as a magnet and is called an electromagnet.

The two uses of an electromagnet are-

i. Used in electrical devices like motors, generators etc.

ii. Used to lift heavy iron pieces.

11. State and define S.I unit of magnetic field?

Ans: The S.I unit of magnetic field is Tesla (T). It states that 1meter long conductor carrying 1 ampere current experiences 1 Newton force, when placed perpendicular to the direction of magnetic field then the magnetic field strength is 1 Tesla.

12. A current carrying conductor is placed perpendicular to the uniform magnetic field. What happens to displacement of the conductor if

i. strength of current increases

Ans: The displacement of the conductor will increase on increasing the strength of current.

ii. If horseshoe magnet is replaced by a weak horse shoe magnet.

Ans: The displacement of the conductor will decrease on using a weak horseshoe magnet.

13. Draw magnetic field around a bar magnet.

Ans: The magnetic field around a bar magnet is as follows:

14. Why don’t two magnetic lines of force intersect each other?

15. Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.

Ans: According to the right-hand rule inside the loop, the magnetic field lines are directed perpendicular to the plane of paper in the inward direction while outside the loop magnetic field lines are directed out of the plane paper.

16. What is the role of the split ring in an electric motor?

Ans: Split ring is used for reversing the direction of current in the coil. It acts as a commutator i.e., the direction of current flowing in the motor coil reverses after half turn, giving rise to a continuous rotation of the coil and the axle.

17. State the principle of an electric generator.

Ans: The principle of an electric generator is electromagnetic induction i.e., When a rectangular coil is rotated in a uniform magnetic field, an induced emf is generated between the ends of the coil.

18. Which sources produce alternating current?

Ans: The sources that produce alternating current are-

House generators

Car alternators

Bicycle dynamos

Hydroelectric Power Plants

Thermal power generators

Nuclear power generators,

AC generators etc.

19. Name two safety measures commonly used in electric circuits and appliances.

Ans: The two safety measures commonly used in electric circuits and appliances are-

use of earth wire and proper earthing.

use of fuse or MCB.

20. State whether the following statements are true or false.

a. An electric motor converts mechanical energy into electrical energy.

b. An electric generator works on the principle of electromagnetic induction.

c. The field at the centre of a long circular coil carrying current will be parallel straight line

d. A wire with green insulation is usually the live wire of an electric supply.

21. When is the force experienced by a current-carrying conductor placed in magnetic field largest?

Ans: When the conductor is placed with its length in a direction perpendicular to that of the magnetic field then the force experienced by a current-carrying conductor placed in the magnetic field largest.

22. Name some devices in which electric motors are used.

Ans: Electric motors are used in all devices where we want to convert electrical energy into Mechanical energy. Some devices in which electric motors are used are-

Water pumps

Washing machines etc

23. When does an electric short circuit occur?

Ans: An electric short circuit occurs when the current in the circuit rises rapidly and the electrical connection draws an excessive amount of current from the supply it is because if either the insulation of wires used in an electric circuit is damaged or there is a fault in the appliances, live wire and neutral wire may come in direct contact.

24. Why is the earth pin thicker and longer than the live and the neutral pins?

Ans: The earth pin is made longer so that even by mistake it cannot be inserted into the hole for the live or neutral connection of the socket or it gets connected to the earth terminal earlier than the live and neutral pins and it is made thicker so that it does not enter into the live or neutral sockets.

25. A current-carrying straight conductor is placed in the east-west direction. What will be the direction of the force experienced by this conductor due to earth’s magnetic field? How will this force get affected?

a. reversing the direction of flow of current

Ans: The direction of earth’s magnetic field is from south to north and if current is from west to east. Therefore, force is vertically upwards. By reversing the direction of current, the direction of force will be reversed i.e., vertically downwards.

b. doubling the magnitude of current

Ans: The direction of earth’s magnetic field is from south to north and if current is from west to east. Therefore, force is vertically upwards. By doubling the magnitude of current the magnitude of the force is doubled.

26. Give two uses of electromagnets.

Ans: The two uses of electromagnets are-

27. A straight wire carrying electric current is moving out of plane of paper and is perpendicular to it. What is the direction and type of induced magnetic field?

Ans: If a straight wire carrying electric current is moving out of the plane of paper and is perpendicular to it then the induced magnetic field will be in the form of concentric circles in the plane of paper.

28. Why does the bulk of iron filings stick to the ends of a bar magnet and not at its centre?

Ans: Since at the ends magnetic strength is maximum and at canters magnetic strength is least. Therefore, the bulk of iron filings slick to the ends of a bar magnet and not at its centre.

29. A student draws three magnetic field lines 1,2 and 3 of a bar magnet with the help of a compass needle as shown in figure.

a. Is this configuration possible?

Ans: No, this configuration is not possible.

b. If not, what is

Ans: Because two field lines cannot intersect, and the direction of some field lines are wrong.

30. Suppose you are sifting in a room facing one of the wall. An electron beam moving horizontally from your back goes towards the wall in front you deflected to our left, what is the direction of magnetic field in the room?

Ans: The direction of the magnetic field in the room will be vertically upward.

31. A current through a horizontal power line flows in north to south direction. What is the direction of magnetic field directly above it?

i. at a point directly below it and

Ans: The direction of the magnetic field is West to East.

ii. at a point

Ans: The direction of the magnetic field is East to West.

32. Electric appliances like electric -press, toaster, fans etc are connected to electric mains through three-pin plug. Why?

Ans: Electric appliances are connected to three pin plugs because heavy appliances require earth wire to prevent short circuiting and to prevent users from getting shock in case of leakage of any current.

Short Answer Questions (3 Marks)

1. What is the function of an earth wire? Why is it necessary to earth metallic casing of electric appliances?

Ans: The earth wire is used for the safety measures that have green insulation and is connected to a metal plate deep in the earth near our houses. Appliances like the electric press, toaster, table fan, refrigerator, etc have the metallic body that needs to connect to the earth wire this will provide a low resistance path for the. Thus, if any leakage of current occurs to the metallic body of the appliance it keeps potential to that of the earth, and this may prevent the severe electric shock.

2. We know a current-carrying conductor placed in a magnetic field experience a force due to which the conductor moves. How do we think the rod displaces if

(a) current in the rod is increased

Ans: Force acting on the current-carrying conductor depends on the strength of the magnetic field, amount of current flowing in the conductor, and length of the conductor. Therefore, when the current in the rod increase then the force also increases hence displacement of the rod increases.

(b) a stronger horseshoe is inserted

Ans: Force acting on the current-carrying conductor depends on the strength of the magnetic field, amount of current flowing in the conductor, and length of the conductor. Therefore, when a stronger horseshoe magnet is inserted, the magnetic field increases. So, force increase. Hence displacement increases.

Ans: Force acting on the current-carrying conductor depends on the strength of the magnetic field, amount of current flowing in the conductor, and length of the conductor. Therefore, when the length of the rod increase, force increases, and hence displacement increases.

3. What is the principle of electric motor?

Ans: Electric motor is a rotating device that can convert electrical energy into mechanical energy. Which works on the principle that a current-carrying conductor placed perpendicular to a magnetic field experience a force.

State the function of,

(i) split ring

Ans: It acts as a commutator. The split ring reverses the direction of current through the coil after every half rotation and thus the direction of force is also reserved. As a result, the dc motor continues to rotate in the same direction.

(ii) field magnet used in the electric motor.

Ans: Field magnet used in the electric motor provided a strong magnetic field.

4. State three factors on which magnetic field produced by a current-carrying solenoid depends.

Ans: The three factors on which the magnetic field produced by a current-carrying solenoid depends are the strength of the current flowing through the solenoid, the number of turns of the wire of the solenoid, and the nature of the material inside the solenoid.

5. What is a solenoid? Draw magnetic field lines showing the magnetic field inside and outside the current-carrying solenoid?

Ans: A solenoid is a coil that has many circular turns of insulated copper wire, which are arranged closely in the shape of a cylinder.

(a) Name four appliances wherein an electric motor is used as an important component. In what respect is it different from a generator?

Ans: The four appliances which have electric motor inside them are Mixers, washing machines, refrigerators, and blenders. In electric motor electrical energy is converted into mechanical energy whereas, in an electric generator mechanical energy is used to produce electricity.

(b) Define the terms used in the generator

(i) armature

Ans: Armature is a coil of a large number of turns of insulated copper wire wound over a soft iron core.

(ii) slip rings

Ans: Rings made up of brass that rotates along with the coil and helps in reversal of the direction of the current.

(iii) brushes

Ans: Brushes are made up of carbon which is pressed against the slip rings and are connected to an external circuit where output is obtained.

(a) What is the standard colour code followed for

(ii) neutral and

(iii) earth wires used in electric circuits?

(b) Which part of an electric appliance is earthed and why?

Ans: The metallic case of an electrical appliance is earthed because metals are good conductors of electricity and in case of current leakage i.e. live wire touches the metallic case of an appliance and then due to proper earthing all the excess amount of current flows down to the earth and thus, we can prevent ourselves from an electric shock.

(a) What is short-circuiting?

Ans: Overloading occurs when live and neutral wires come into direct contact, in that case, the current in the circuit increases abruptly. This is called short-circuiting.

(b) What is overloading? How can you avoid overloading?

Ans: Overloading means a huge amount of current flows in the circuit. It can occur when live and neutral wires come into direct contact. It can be avoided by not using too many appliances in a single socket and by using a fuse in the circuit which can prevent damage to the appliances and the circuit.

9. Define electromagnetic induction? Two circular coils A and B are placed close to each other. If the current in the coil A is changed, will some current be induced in the coil B? Explain.

Ans: Electromagnetic induction is a process by which the production of induced current in a conductor due to the change in the magnetic field in another conductor. When the current in first coil A is changed, the magnetic field associated with coil A also changes. Thus, the magnetic field lines around the secondary coil B will also change. Hence the change in magnetic field lines associated with the secondary coil B will induce electric current in it.

10. Why does a current carrying conductor keep in a magnetic field experience force? What is the direction of force acting on the conductor?

Ans: A current-carrying conductor is kept in a magnetic field experience force. This is because the electric current that flows through a conductor, produces this magnetic field. A force that is equal in magnitude and opposite in direction is exerted by this magnetic field.

(a) Distinguish between A.C and D.C?

Ans: The difference between AC and DC is listed below:

(b) Which source produces alternating current?

Ans: The sources that produce alternating current are AC generators, hydroelectric power plants, nuclear power generators, and thermal power generators.

(a) Define the term current rating of an electric fuse?

Ans: The maximum amount of current that can be passed through the fuse wire without melting it.

(b) Name the material used to make an electric fuse?

Ans: Alloy of Lead and Tin is used to make an electric fuse.

Ans: Electric fuses and earth wire.

13. Why does a compass needle get deflected when brought near a bar magnet?

Ans: The compass needle is a small bar magnet. When a compass needle is brought near a bar magnet, its magnetic field lines interact with that of the compass needle. Then due to repulsive force between like poles and attraction between unlike poles, the compass needle is deflected.

14. List the properties of magnetic lines of force.

Ans: Properties of magnetic field lines of force are as follows:

i. Outside a magnet, the field lines are directed from the N-pole of the magnet towards the S-pole, and inside the magnet, lines are directed from S-pole to N-pole.

ii. Magnetic field lines are closed curves.

iii. No two magnetic field lines intersect each other.

iv. The density of magnetic lines decreases, when the distance between the poles increases.

15. In activity 13.7, how do we think the displacement of rod AB will be affected if

(i) current is rod AB is increased,

Ans: If the current in rod AB is increased then its displacement will also increase.

(ii) a stronger horseshoe magnet is used, and

Ans: If a stronger horseshoe magnet is used then the displacement of rod AB will also increase.

(iii) length of the rod AB is increased?

Ans: If the length of the rod AB is increased, the force acting on it will increase hence, displacement of the rod also increases.

16. State Fleming’s left-hand rule.

Ans: Fleming’s left-hand rule states that stretch the forefinger, the central finger, and the thumb of your left hand in a way they mutually perpendicular to each other. If the forefinger shows the direction of the magnetic field and the central finger that of the current, then the thumb will point towards the direction of motion of the conductor or the force acting.

17. What is the principle of an electric motor?

Ans: Electric motor is a rotating device that can convert electrical energy into mechanical energy. An electric motor is based on the principle that the current-carrying conductor experiences a force when placed in a magnetic field. The direction of the force is given by Fleming’s left-hand rule, if the direction of the magnetic field and that of the current are mutually perpendicular.

18. Explain different ways to induce current in a coil.

Ans: If a coil is moved rapidly between the south and north poles of a horseshoe magnet, relative to a coil the magnet is moved, and By keeping the coil still and rotating a magnet inside it are the different ways to induce a current in a coil.

19. An electric oven of \[2\] kW power rating is operated in a domestic electric circuit ( \[220\] V) that has a current rating of \[5\] A. What result do you expect? Explain.

Ans: The power rating of the electric oven (P) \[=2\text{ }kW\text{ }\]

\[\Rightarrow 2\times 1000=2000W\]

Current drawn \[(I)=\dfrac{P}{V}\]

\[\Rightarrow \dfrac{2000}{220}=9.09A\]

The current rating of the domestic electric circuit is given as $5$ A and the oven draws a current of \[9.09A\]. Which is more than the current rating; hence the circuit will be damaged due to overheating or overloading.

20. What precaution should be taken to avoid the overloading of the domestic electric circuit?

Ans: Two separate circuits should be used for domestic purposes, one of 5A current rating of bulbs, fans, tubes, etc., and the other 15 A current rating for appliances with a higher current rating such as geysers, air coolers, electric iron, and stoves, etc. Too many appliances should never be connected to a single socket. A fuse of appropriate current rating should be used with the electric circuit for proper safety. These are the precautions we should take to avoid the overloading of domestic electric circuits.

21. List three methods of producing a magnetic field.

Ans: Three methods of producing magnetic fields are as follows,

Using permanent magnets or horse-shoe magnets at the place where the magnetic field is required.

By using electromagnets

Using current-carrying conductors or a current-carrying coil.

22. How does a solenoid behave like a magnet? Can you determine the north and south poles of a current-carrying solenoid with the help of a bar magnet? Explain.

Ans: The solenoid has a soft iron core with insulated copper wire over it so it can behave like a magnet. A strong and uniform magnetic field is produced around the solenoid when a current is passed through it. which is similar to that of the magnetic field of a bar magnet.

Solenoid behaves like a strong bar magnet. We can determine the poles of magnets formed by solenoids. The solenoid repels if the north pole of a bar magnet is brought near the negative terminal of the battery, the same for the south pole. As we know, poles repel each other.

23. Imagine that you are sitting in chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field?

Ans: From the problem, it is clear that an electron beam moving horizontally from the back wall towards the front wall is equivalent to a current flowing in the opposite direction. The deflection of the electron beam as seen by the observer is to his right side. Then by applying Fleming’s left-hand rule we find that the magnetic field is acting in a vertically downward direction.

24. A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is

(i) pushed into the coil.

Ans: When a bar magnet is pushed into the coil of insulated copper wire connected to a galvanometer, the galvanometer gives a deflection towards the left direction.

(ii) withdrawn from inside the coil

Ans: When the bar magnet is withdrawn from inside the coil, then an induced current is set in the coil that deflects the galvanometer in the right direction.

(iii) held stationary inside the coil?

Ans: If the bar magnet is held stationary inside the coil, then there won’t be any induced current so the galvanometer does not show any deflection.

25. Two circular coils A and B are placed close to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.

Ans: Yes, If the current in coil A is changed, then some current will be induced in coil B.

As the two circular coils, A and B are placed close to each other. When the current in coil A is changed, the magnetic field associated with it also changes. As coil B is placed near coil A, the magnetic field lines around coil B also change. Due to changes in magnetic field lines associated with coil B, a current is induced in coil B.

26. State the rule to determine the direction of a

(i) magnetic field produced around a straight current carrying conductor

Ans: The direction of the magnetic field produced around a straight conductor can be determined from the “Right-hand thumb Rule”.

(ii) force experienced by a current carrying straight conductor

Ans: To find the direction of force experienced by a current-carrying straight conductor placed in a magnetic field we make use of “Fleming’s left-hand rule”.

(iii) current induced in a coil due to its rotation in a magnetic field.

Ans: For finding the direction of current induced in a coil we use “Fleming’s right-hand rule”.

27. What is the function of an earth wire? Why is it necessary to earth metallic appliances?

Ans: The earth wires function as a safety measure, especially for those appliances like heater, electric, press, room cooler, etc that have a metallic body. The metallic body of the appliance is connected to the earth wire, which provides a low resistance conducting path for electric current. It ensures that any leakage of current to the metallic body of an appliance keeps its potential the same as of earth. As a result, the user is safe from severe electric shock, even if a user touches the body of the appliance.

28. An electron enters a magnetic field at right angles to it as shown in fig. The direction of the force acting on the electron will be:

to the right (b) to the left (c) out of the page (d) into the page

Ans: An electron enters a magnetic field at right angles to it so the direction of the force acting on the electron will be into the page.

When a conductor carrying current is placed perpendicular to the direction of the magnetic field, then the direction is given by Fleming’s left-hand rule. According to Fleming's Left-Hand rule, we know that the direction of force is perpendicular to the direction of the magnetic field and current. Here, the direction of current can be taken as the opposite to the direction of motion of electrons. The force acting on an electron is opposite to that. Therefore, in this case, it is into the page.

29. Consider a circular wire lying in the plane of the table and the direction current in it is antilock wise.

(i) Draw the magnetic field lines produced around it.

(ii) Why does magnetic field at the center of current carrying circular loop appear straight? Explain with diagram.

Ans: Because of the large curvature of magnetic field lines at centre.

30. If we place a compass needle near straight conductor carrying current

(a) What happens to the deflection of the compass needle if the direction of current reversed.

Ans: If we place a compass needle near a straight conductor carrying current then the deflection of the compass needle will reverse if the direction of current is reversed.

(b) What change will you notice in the compass needle if it is moved away from conductor but the current through the conductor remains the same?

Ans: If we place a compass needle near a straight conductor carrying current Deflection will decrease in the compass needle if it is moved away from the conductor but the current through the conductor remains the same.

31. A magnet is moving towards a coil as shown in figure.

(1) Which phenomenon is shown in figure.

Ans: Electromagnetic induction

(2) Which physical quantity is between magnet and coil? set up in the coil when there is a relative motion

Ans: Induced current

(3) What may be the cause of the production of that physical quantity?

Ans: Change in magnetic lines of forces through the coil

32. Suppose your science teacher asks you to demonstrate the phenomena of EMI with following materials:

(a) Two different coils land 2 of copper wire having large no. of turns 50 and 100 respectively.

(b) A non-conducting cylinder

(d) A plug key

(e) A galvanometer

(i) Draw a labeled diagram of your demonstration setup.

(ii) How will you prove the phenomena of EMI.

Ans: When the key is closed, there is deflection in the galvanometer.

Long Answer Questions (5 Marks)

1. Current- time graph from two different sources are shown in the figure.

(i) Name the type of current shown by graph (A) and (B)?

Ans: Graph A represents direct current and graph B represents alternating current.

(ii) Name any one source of shown by (A) and (B)?

Ans: Source of (A) can be dry cell and Source of (B) can be AC generator.

(iii) What is frequency of current in case (B)?

Ans: As graph B represents the alternating current the frequency is given by, $f=\dfrac{1}{T}$

$\Rightarrow f=\dfrac{1}{0.02}=50Hz$

(iv) Write two differences between current shown by (A) and (B)?

Ans: The differences between AC and DC is listed below

2. Explain the principle, construction and working of an electric motor with the help of a labeled diagram?

Principle: The electric motor is a rotating device that can convert electrical energy into mechanical energy. An electric motor is based on the principle that the current-carrying conductor experiences a force when placed in a magnetic field. The direction of the force is given by Fleming’s left-hand rule if the direction of the magnetic field and that of the current are mutually perpendicular.

Construction:

(i) Armature or coil- It consists of an insulated copper wire wound on a soft iron core.

(ii) Strong field magnet- two pole pieces of a strong magnet that can provide a strong magnetic field.

(iii) Split ring – split ring acts as a commutator which has two halves (R 1 and R 2 ) of a metallic ring that reverses the direction of the current in a coil.

(iv) Brushes- two carbon brushes touch the commutator (split ring).

(v) Battery – a battery is connected across the brushes.

Working : From the figure, ABCD is a rectangular coil of insulated copper wire and this coil is placed between the south and north poles of a magnetic field in such a way that the AB and CD are perpendicular to the direction of the magnetic field. The ends of the coil are connected to the two halves of a split ring, say P and Q. The external conducting edges of P and Q can touch two conducting stationary brushes X and Y.

Let the current in the coil ABCD of motor enters from the source battery through the conducting brush X, flow along ABCD, and finally flows back to the battery through brush Y. On applying Fleming’s left-hand rule we find that force acting on arm AB due to magnetic field pushes it downwards. But the force acting on the arm CD pushes it upwards. Thus, the coil and the axle rotate anticlockwise. Due to the action of split rings, P and Q change their contacts with brushes. Now, P makes contact with Y and Q with X. As a result, the current begins to flow in coil along DCBA. The arms are pushed in opposite directions and the coil continues to rotate in the same direction.

3. Draw a labeled diagram of an electric motor. Explain its principle and working. What is the function of split ring in an electric motor?

Ans: Electric motor labeled diagram of an electric motor is as follows:

Working : Let the current in the coil ABCD of motor enters from the source battery through the conducting brush X, flow along ABCD, and finally flows back to the battery through brush Y. On applying Fleming’s left-hand rule we find that force acting on arm AB due to magnetic field pushes it downwards. But the force acting on the arm CD pushes it upwards. Thus, the coil and the axle rotate anticlockwise. Due to the action of split rings, P and Q change their contacts with brushes. Now, P makes contact with Y and Q with X. As a result, the current begins to flow in coil along DCBA. The arms are pushed in opposite directions and the coil continues to rotate in the same direction.

Split ring : It acts as a commutator. The split ring reverses the direction of current through the coil after every half rotation and thus the direction of force is also reserved. As a result, the dc motor continues to rotate in the same direction.

4. Explain the underlying principle and working of an electric generator by drawing a labeled diagram. What is the function of brushes?

Ans: Electric generator labeled diagram is given as follows:

Principle: An electric generator works on the principle of electromagnetic induction.

Working: In an electric generator, a rotating rectangular coil ABCD is placed between the south and north poles of a permanent magnet. As shown in the figure the two ends of this coil are connected to the two rings R1 and R2. Let the, in the beginning, brushes B1 and B2 are kept pressed separately on rings R1 and R2 respectively. The two rings are internally attached to an axle which may be mechanically rotated from outside for the rotation of the coil inside the magnetic field. To show the flow of current in the given external circuit, the outer ends of the two brushes are connected to the galvanometer. The arm AB moves upwards and the arm CD moves downwards when the axle attached to the two rings R1 and R2 is rotated then the magnetic field is produced by the permanent magnet. By applying the induced currents are in these arms along the directions AB and CD by Fleming’s right-hand rule. Thus, in the direction of ABCD an induced current flows. The current in the external circuit flows from B2 to B1.

After half rotation, arm AB moves downward and arms CD upward to change the direction opposite to the first case. Thus, after every half rotation current changes its direction and an alternate current is obtained in the generator. Brushes B1 and B2 are kept pressed on the two slip rings R1 and R2 separately. The outer ends of the brushes are connected to the galvanometer. Thus, brushes help to show the flow of current in the given external circuit.

A magnet is a material that has two poles namely a north pole and a south pole.

2. Magnetic Field and Magnetic Field Lines

A magnetic field is a phenomenon that is found in the area around a magnet or an electric current that creates a magnetic force on the object placed near it.

(Image will be Uploaded soon)

Magnetic field visually lines represent a magnetic field.

A magnetic field possesses both magnitude and direction.

The effect of the magnetic field is always maximum near the magnet and it decreases as the distance increases.

A compass needle also acts as a bar magnet.

The shape of the magnetic field around a current-carrying straight wire is in the form of concentric circles.

3. Right-Hand Thumb Rule or Maxwell’s Corkscrew Rule

The direction of the magnetic field around a current carrying-conductor is detected with the help of right-hand thumb rule.

Maxwell’s corkscrew rule is another method for detecting the direction of magnetic field lines around a straight current-carrying conductor.

If a straight wire is bent into a circle, the direction of the magnetic field of the circular wire can be found at each part of the wire with the application of right-hand thumb rule.

The shape of the magnetic field lines is in the form of straight lines towards the centre of the circular current-carrying wire due to decrease in strength.

4. Solenoid

A solenoid is a cylindrical shaped coil of wire whose one end acts as a magnetic north pole and the other end acts as a magnetic south pole similar to that of a bar magnet and the magnetic field is uniform inside it.

An electromagnet can be made when a piece of magnetic material is placed inside the solenoid.

5. Fleming’s Left-Hand Rule

When a current-carrying conductor and a magnet are placed near, they produce an equal and opposite force on each other that becomes maximum when the direction of the magnetic field and electric current is at 90°.

The direction of the force is found out with the application of Fleming's left-hand rule where the thumb represents the direction of the force and the index finger and middle finger represents the magnetic field and current respectively. The three fingers are perpendicular to each other.

6. Electric Motor

The electrical energy can be converted into mechanical energy with the help of an electric motor.

The presence of the electric current in a circuit is detected with the help of a galvanometer.

7. Electromagnetic Induction

When a magnet is moved near an electric coil attached to a galvanometer, it produces a potential difference that creates an induced current in the coil. This process is called electromagnetic induction.

The direction of the induced current can be found out with the application of Fleming's right-hand rule.

8. Electric Generator

The device in which mechanical energy is used to rotate a conductor inside a magnetic field to produce electric current is called an electric generator.

The electric current is of two types - Direct current and Alternating current.

When the electric current alters direction at equal intervals, it is called alternating current. The device that produces alternating current is called an AC generator.

When the electric current does not change direction with time, it is called direct current. The device that produces direct current is called a DC generator.

9. Electric Fuse

An electric fuse stops the flow of high electric current during overloading or short-circuiting occurs in our home.

The students are advised to refer to the above-given summary before attempting the important questions for class 10 science chapter 13. The students can download the Vedantu app on mobile and tablets also to access the PDF of chapter 13 science class 10 important questions . Apart from the NCERT question, the students must have a look at the class 10 science chapter 13 extra questions provided by Vedantu to hone their knowledge regarding the magnetic effects of electric current.

Important Related Links for CBSE Class 10 Science

FAQs on Important Questions for CBSE Class 10 Science Chapter 13 - Magnetic Effects of Electric Current 2024-25

Q1. What are the properties of magnetic field lines according to Chapter 13 of Class 10 Science?

Ans: Magnetic field lines refer to imaginary lines that are drawn around a magnet. The line's density generally tests the magnitude of a magnetic field. Magnetic field lines consist of many properties. Some of them include:

Magnetic field lines cannot traverse between each other

Magnetic field lines can emerge from the north pole but terminate from the south pole.

The direction of magnetic fields inside a magnet is from the south pole to the north pole.

Q2. Define Fleming's left-hand rule according to Chapter 13 of Class 10 Science.

Ans: With the help of Fleming's left-hand rule, one can determine the direction of the magnetic field. According to this rule, if you put your middle finger, forefinger, and thumb of your left hand at right angles perpendicular to the same of your right hand then the direction to which the thumb is pointing detects the direction of the magnetic force. Whereas the middle finger and the forefinger will determine the direction in which the magnetic field moves.

Q3. What are the important concepts in Chapter 13 of Class 10 Science?

Ans: Magnetic Effects of Electric current is an important chapter for Class 8 Science from the examination point of view. There are many important concepts that Students must learn and understand in this chapter. Some of these concepts include a definition of the magnet, magnetic field and magnetic field lines, Maxwell's Corkscrew rule, solenoid, Fleming's left-hand rule, electric motor, electromagnetic induction, electric generator, and electric fuse. There are many important questions that are taken from these important concepts.

Q4. What is the cause of the magnetic effect of current as explained in Chapter 13 of Class 10 Science?

Ans: It is known that electric current has the capacity to produce magnetic effects. This magnetic effect of electric current is popularly known as the electromagnetic effect. For example, a solenoid behaves like a magnetic bar when electric current passes through it. Similarly, When a compass is brought close to an electric current conductor, then the needle of the compass gets deflected. This mainly happens because of the flow of electricity in the conductor. This observation proves that electric current does produce a magnetic effect.

Q5. Are there any Numerical in the magnetic effect of electric current topic of Chapter 13 of Class 10 Science?

Ans: Yes, there are numericals available in Chapter 8 of Class 8 Science. The magnetic effect of electric current is an important chapter for Students to learn from the examination point of view. There are many important questions that are asked in this chapter. Out of which, the numerical questions are the most important ones. The main formulas in the chapter help to calculate the electric flow. Vedantu provides students with a simple explanation of all numerical questions.

CBSE Class 10 Science Important Questions

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Class 10th Science - Magnetic Effects of Electric Current Case Study Questions and Answers 2022 - 2023

Class 10th Science - Magnetic Effects of Electric Current Case Study Questions and Answers 2022 - 2023 Study Materials Sep-09 , 2022

QB365 provides a detailed and simple solution for every Possible Case Study Questions in Class 10 Science Subject - Magnetic Effects of Electric Current, CBSE. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.

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Magnetic effects of electric current case study questions with answer key.

Final Semester - June 2015

An insulated copper wire wound on a cylindrical cardboard tube such that its length is greater than its diameter is called a solenoid. When an electric current is passed through the solenoid, it produces a magnetic field around it. The magnetic field produced by a current-carrying solenoid is similar to the magnetic field produced by a bar magnet. The field lines inside the solenoid are in the form of parallel straight lines. The strong magnetic field produced inside a current-carrying solenoid can be used to magnetise a piece of magnetic material like soft iron, when placed inside the solenoid. The strength of magnetic field produced by a current carrying solenoid is directly proportional to the number of turns and strength of current in the solenoid. (i) The strength of magnetic field inside a long current -carrying straight solenoid is (a) more at the ends than at the centre (b) minimum in the middle (c) same at all points (d) found to increase from one end to the other. (ii) The north-south polarities of an electromagnet can be found easily by using

(ii) If a charged particle is moving along a magnetic field line. The magnetic force on the particle is

(iii) When current is switched ON, an electric fan converts

(iv) In an electric motor, device that makes contact with the rotating rings and through them to supply current to coil is

(v) In an electric motor, the direction of current in the coil changes once in each

(ii) What will happen if a soft iron bar is placed inside the solenoid? (a) The bar will be electrocuted resulting in short-circuit. (b) The bar will be magnetised as long as there is current in the circuit. (c) The bar will be magnetised permanently. (d) The bar will not be affected by any means. (iii) The magnetic field lines produced inside the solenoid are similar to that of … (a) a bar magnet (b) a straight current carrying conductor (c) a circular current carrying loop (d) electromagnet of any shape (iv) After analysing the graph a student writes the following statements. I. The magnetic field produced by the solenoid is inversely proportional to the current. II. The magnetic field produced by the solenoid is directly proportional to the current. III. The magnetic field produced by the solenoid is directly proportional to square of the current. IV. The magnetic field produced by the solenoid is independent of the current. Choose from the following which of the following would be the correct statement(s).

(iii) The magnetic effect of current was discovered by :

(iv) The magnetic field inside a long straight solenoid carrying current :

(v) If the direction of electric current in a solenoid when viewed from a particular end is anticlockwise, then this end of solenoid will be :

(iv) A plotting compass is placed near the south pole of a bar magnet. The pointer of plotting compass will : (a) point away from the south pole (b) point parallel to the south pole (c) point towards the south pole (d) point at right angles to the south pole (v) Which of the following statements is incorrect regarding magnetic field lines ? (a) The direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points. (b) Magnetic field lines are closed curves (c) If magnetic field lines are parallel and equidistant, they represent zero field strength (d) Relative strength of magnetic field is shown by the degree of closeness of the field lines

(iv) According to right-hand thumb rule direction of the curl of fingers of the right hand gives the

(v) In case of circular loop carrying current, the strength of magnetic field is (a) constant everywhere (b) stronger inside the loop than outside the loop (c) weaker inside the loop than outside the loop (d) none of these

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Extra Questions for Class 10 Science Chapter 13 Magnetic Effect of Electric Current

Get extra questions for Class 10 Science Chapter 13 Magnetic Effect of Electric Current with PDF. Our subject expert prepared these solutions as per the latest NCERT textbook. These extra questions will be helpful to revise the important topics and concepts. You can easily download all the questions and answers in PDF format from our app.

Magnetic Effect of Electric Current Class 10 Science Extra Questions with Answers

Question 1: Name the type of current: (a) used in household supply. (b) given by a cell.

Answer: (a) Alternating current. (b) Direct current.

Question 2: State the direction of magnetic field in the following case.

Class 10 Chapter 13 Magnetic Effects of Electric Currents Extra Questions 1

Question 3: Name the physical quantities which are indicated by the direction of thumb and forefinger in the Fleming’s right hand rule?

Answer: In Fleming’s right hand rule, thumb indicates — direction of motion of the conductor; forefinger indicates — direction of magnetic field.

Class 10 Chapter 13 Magnetic Effects of Electric Currents Extra Questions 3

Question 4: A positively charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is

(a) towards north (b) towards east (c) downward (d) upward

Answer: (d) Upward (Apply Fleming’s left hand rule).

Question 5: A charged particle enters at right angle into a uniform magnetic field as shown. What should be the nature of charge on the particle if it begins to move in a direction pointing vertically out of the page due to its interaction with the magnetic field?

Class 10 Chapter 13 Magnetic Effects of Electric Currents Extra Questions 5

Answer: Using Fleming’s left hand rule, the nature of charged particle is positive.

Question 6: Name any two appliances which are based on the application of heating effect of electric current.

Answer: Room heater and geyser.

Question 7: Why and when does a current carrying conductor kept in a magnetic field experience force? List the factors on which direction of this force depends?

Answer: The drifting of free electrons of a conductor in a definite direction causes the current to flow through it. When such conductor is placed in a uniform magnetic field, each drifted electron of a conductor experience a magnetic force. This force is collectively experience by a conductor as a whole. Hence a current carrying conductor kept in a magnetic field experience a force. The direction of magnetic force depends on (i) direction of current through the conductor, and (ii) direction of magnetic field.

Question 8: How is the strength of magnetic field near a straight current-conductor (i) related to the strength of current in the conductor? (ii) is affected by changing the direction of flow of current in the conductor?

Answer: (i) The strength of magnetic field around a straight current conductor increases on increasing the strength of current in the conductor or vice versa.

(ii) The direction of magnetic field around a straight current carrying conductor gets reversed if the direction of current through that conductor is reversed.

Question 9: What is meant by the term ‘frequency of an alternating current’? What is its value in India? Why is an alternating current considered to be advantageous over direct current for long range transmission of electric energy?

Answer: Frequency of Alternating current is equal to the number of cycles completed in one second. In India, frequency of AC is 50 Hz i.e. 50 cycles per second.

An alternating current is considered to be advantageous over direct current for long range transmission of electric energy because it can be transmitted over long distances to distant places without much loss of electric power as compared to direct current.

Question 10: Explain any two situations that can cause electrical hazards in domestic circuits.

Answer: (i) Connecting too many electrical devices to a single socket or in the extension cord for any length of time draws high current from the mains that will exceed the current rating of connecting wires. The wires cannot withstand such a high current and melt and may cause fire.

(ii) Most electrical hazards in domestic circuits are caused by the faulty electrical outlets, old and out-dated appliances. The chances of short circuit i.e., contact of live wire and neutral wires with each other due to damage in their insulation or some fault in the appliances are very high. It may result spark at the contact point which may even cause fire,

Question 11: List major differences between an electric motor and a generator.

Question 12: The given magnet is divided into three parts A, B, and C. Name the parts where the strength of the magnetic field is: (i) maximum (ii) minimum. How will the density of magnetic field lines differ at these parts?

Answer: (i) Maximum strength – at A and C

(ii) Minimum strength – at B At A and C, magnetic field lines are crowded while at B, they are spread out.

Question 13: A compass needle is placed near a current-carrying wire. State your observation for the following cases, and give reason for the same in each case. (a) Magnitude of electric current in the wire is increased. (b) The compass needle is displaced away from the wire.

Answer: (a) Observation: The deflection of the needle increases.

Reason: Magnetic field strength due to current-carrying wire increases as current in the wire increases, B ∝ I

(b) Observation: The deflection in the compass needle decreases as its displacement from the current carrying wire increases.

Reason: The strength of magnetic field reduces with the increase in distance from the wire as B ∝ I/r.

Question 14: (a) Two magnets are lying side by side as shown below. Draw magnetic field lines between poles P and Q.

(b) What does the degree of closeness of magnetic field lines near the poles signify?

Class 10 Chapter 13 Magnetic Effects of Electric Currents Extra Questions 14 ii

(b) The degree of closeness of magnetic field lines near the poles signify that the field is stronger there, i.e. the pole of another magnet when placed in the magnetic field experiences a greater force where the field lines are crowded.

Question 15: Magnetic field lines of two magnets are shown in fig. A and fig. B.

Class 10 Chapter 13 Magnetic Effects of Electric Currents Extra Questions 15

Select the figure that represents the correct pattern of field lines. Give reasons for your answer. Also name the poles of the magnets facing each other.

Answer: Figure B represents the correct pattern of field lines. In figure A, field lines cross each other which is not possible because if they cross each other, at the point of intersection, there would be two directions of field lines.

In figure B, field lines are emerging in nature, so poles of magnet facing each other are north poles while opposite faces will have south polarity.

Question 16: Insulation cover of which colour is conventionally used for earth wire? Why is an earth wire connected to metallic parts of appliances?

Answer: For earth wire, green or yellow colour insulation is used. The earth wire provides the low resistance conducting path for the current and maintains the potential of appliances body with that of the earth. So, earth wire is used as a safety measure.

Question 17: Identify the poles of the magnet in the given figure (1) and (2).

Class 10 Chapter 13 Magnetic Effects of Electric Currents Extra Questions 17 i

Answer: Field lines emerge from north pole (N) and merge at the south pole (S) as shown in both the figures

Class 10 Chapter 13 Magnetic Effects of Electric Currents Extra Questions 17 ii

Question 18: Explain the role of fuse in series with any electrical appliance in an electric circuit. Why should a fuse with defined rating for an electric circuit not be replaced by one with a larger rating?

Answer: Fuse is a safety device connected in series with live wire or with any electrical appliance in an electric circuit. It stops the flow of unduly high electric current in the circuit by getting melted due to rise in temperature as per Joule’s law of heating.

High rating fuse wire has the larger capacity. So, it will not stop the flow of any relatively high current. Therefore, electrical devices cannot be protected from the possible damage.

Question 19: The magnetic field associated with a current-carrying straight conductor is in anticlockwise direction. If the conductor was held along the east-west direction, what will be the direction of current through it? Name and state the rule applied to determine the direction of current.

Answer: Direction of current – east to west as determined by Right-hand thumb rule. Ri’-lu-Uand Thumb

Rule: If we hold a current-carrying conductor by right hand in such a way that the stretched thumb is along the direction of current, then the curly fingers around the conductor represents the direction of field lines of magnetic field.

Question 20: Two circular coils A and B are placed close to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.

Answer: Yes, when a current in coil A changes, magnetic field lines linked with coil B also change. Hence, due to change in number of magnetic field lines, there is an induced current in coil B.

Question 21: When is the force experienced by a current-carrying conductor placed in a magnetic field largest?

Answer: When the length of current-carrying conductor and direction of magnetic field are perpendicular to each other, the maximum force is experienced by the current-carrying conductor.

Question 22: State one main difference between A.C and D.C. Why A.C is preferred over D.C for long range transmission of electric power? Name one source each of D.C and A.C.

Answer: Difference between A.C. and D.C. The alternating current (A.C.) reverses its direction periodically whereas the direct current (D.C.) always flows in one direction.

A.C. is preferred over D.C. because it can be transmitted over long distance without much loss of energy.

D.C. source: Battery A.C. source: A.C. generator

Question 23: State the consequences that can lead to a short circuit. (or)

One of the major cause of fire in office building is short circuiting. List three factors which may lead to the short circuit.

Answer: It occurs as a consequence of

failure of electrical insulation’s due to which live wire comes in direct contact with neutral or earth wire.
presence of external conducting material such as water which is introduced accidentally into the circuit.
electrical appliances are forced to operate when its moving parts are jammed.
connection of current carrying parts of electrical equipment’s comes in contact to one another due to human or natural cause and use of less rating wires.
When this happens, there is an excessive electric current which can damage the circuit and may also cause electrical fires.

Question 24: What is short circuiting? State one factor/condition that can lead to it. Name a device in the household that acts as a safety measure for it. State the principle of its working.

Answer: Short circuiting: When electric circuit offers very low resistance to the flow of current through it, the current increases heavily and the circuit is said to be short circuited. It occurs when live wire touches the neutral wire. This happens due to the damage in insulation of the power lines.

Safety measure device: Fuse.

Working principle of fuse: It works on the heating effect of electric current or Joule’s law of heating.

According to this law, the heat produced in a resistor is directly proportional to the

(i) square of current for a given resistance. (ii) resistance for a given current and (iii) time for which the current flows through the resistor.

We know, H = I 2 Rt So, when current in the circuit increases, the wire with low melting point in it melts to the heat generated.

Hence, the circuit breaks and electrical devices and appliances are saved. _

Question 25: Write one application of each of the following: (a) Right-hand thumb rule (b) Fleming’s left hand rule (c) Fleming’s right hand rule

Answer: (a) Right-hand thumb rule is used to find the direction of magnetic field in a coil of wire and the electric current in a straight conductor.

(b) Fleming’s left hand rule is used to find the direction of force exerted on a current carrying conductor placed in a magnetic field as in electric motor.

(c) Fleming’s right hand rule is used to find the direction of induced current in a closed circuit placed in changing magnetic field as in electric generator.

Question 26: State one main difference between A.C. and D.C. Why is A.C. preferred over D.C. for long range transmission of electric power? Name one source each of D.C. and A.C.

Answer: Difference between A.C. and D.C.: The alternating current (A.C.) reverses its direction periodically whereas the direct current (D.C.) always flows in one direction.

Question 27: What is meant by solenoid? How does a current carrying solenoid behave? Give its main use.

Answer: Solenoid: A coil of many circular turns of insulated copper wire wound on a cylindrical insulating body (i.e., cardboard etc.) such that its length is greater than its diameter is called solenoid.

When current is flowing through the solenoid, the magnetic field line pattern resembles exactly with those of a bar magnet with the fixed polarity, i.e. North and South pole at its ends and it acquires the directive and attractive properties similar to bar magnet. Hence, the current carrying solenoid behave as a bar magnet.

Use of current carrying solenoid: It is used to form a temporary magnet called electromagnet as well as permanent magnet.

Question 28: What are magnetic field lines? Justify the following statements

(a) Two magnetic field lines never intersect each other. (b) Magnetic field lines are closed curves.

Answer: Magnetic field lines: It is defined as the path along which the unit North pole (imaginary) tends to move in a magnetic field if free to do so.

(a) The magnetic lines of force do not intersect (or cross) one another. If they do so then at the point of intersection, two tangents can be drawn at that point which indicates that there will be two different directions of the same magnetic which field, i.e. the compass needle points in two different directions which is not possible.

(b) Magnetic field lines are closed continuous curves. They diverge from the north pole of a bar magnet and converge its south pole. Inside the magnet they move from south pole to north pole.

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Magnetic Effects of Electric Current Class 10 Extra Questions with Answers Science Chapter 13

In this page, you can find CBSE Class 10 Science Chapter 13 Extra Questions and Answers Magnetic Effects of Electric Current Pdf free download, NCERT Extra Questions for Class 10 Science will make your practice complete.

Class 10 Science Chapter 13 Extra Questions and Answers Magnetic Effects of Electric Current

Extra Questions for Class 10 Science Chapter 13 Magnetic Effects of Electric Current with Answers Solutions

Magnetic Effects of Electric Current Extra Questions Very Short Answer Type

Question 1. What happens if a current carrying conductor is placed in the magnetic field? Answer: The conductor experiences a force and the direction of this force is given by Fleming’s left hand rule.

Magnetic Effects of Electric Current Extra Questions with Answers

Question 2. On what effect of an electric current does an electromagnet work? Answer: An electromagnet works on the principles of magnetic effect of current.

Magnetic Effects of Electric Current Short Questions with Answers

Question 3. Name the alloy which is mainly used for making permanent magnets. Answer: The alloy ‘Alnico’ is used for making permanent magnets. It is an alloy of aluminium, nickel, cobalt and iron.

Question 4. Why is electromagnetic induction so called? Answer: This is due to the reason that electric current can be produced with the help of varying magnetic field without any physical contact of the source of magnetic field and the conductor.

Question 5. Name an instrument in which the directive property of a magnet is used. Answer: A compass needle

Question 6. What is a solenoid? Answer: Solenoid is a coil of many turns of wire, wrapped in the shape of a cylinder.

Question 7. Which effect of electric current is utilised in the working of an electric fuse? Answer: An electric fuse works on the heating effect of current.

Question 8. What is the frequency of A.C. (alternating current) in India? Answer: It is 50 Hz.

Question 9. What will you do if you see a person coming in contact with a live wire? Answer: Such a person should be provided with an insulated support like wood, plastic or rubber in order to disconnect the person from wire.

Question 10. How can it be proved that a magnetic field exists around a current carrying metallic wire? Answer: When a magnetic compass needle is placed close to the current carrying wire, it will get deflected.

Question 11. How is the strength of the magnetic field at a point near a wire related to the strength of the electric current flowing in the wire? Answer: The magnitude of magnetic field is directly proportional to the strength of the electric current flowing in the wire.

Question 12. How is the fuse connected in an electric circuit? Answer: Fuse is connected in series in the circuit.

Question 13. Why is a fuse usually made of tin or tin-copper alloy? Answer: A fuse is usually made of tin or tin-copper alloy because it has a low melting point.

Question 14. What is the capacity of a fuse commonly used in domestic electrical fittings? Answer: Fuses of capacity 5 ampere or 15 ampere are commonly used in domestic electrical fittings.

Question 15. Name the device used to protect the electric circuits from overloading and short circuiting. Answer: A fuse is used to protect circuits from overloading and short circuiting.

Question 16. On which effect of electricity does fuse work? Answer: Heating effect of current.

Question 17. What kind of magnetic field is produced by a current carrying solenoid? Answer: The magnetic field produced by a current-carrying solenoid is similar to the magnetic field produced by a bar magnet.

Magnetic Effects of Electric Current Class 10 Extra Questions with Answers Science Chapter 13 1

Question 19. State Faraday’s law of electromagnetic induction. Answer: Whenever the magnetic field lines linked with a coil change due to relative motion of a magnet and the coil, an induced current is produced in the coil. The magnitude of induced current is directly proportional to the rate of change of number of magnetic field lines linked to the coil.

Question 20. The frequency of alternating current in India is 50 Hz. What does it mean? Answer: In India, the alternating current changes direction after every $\frac {1}{100}$ second, so the frequency of alternating current is 50 Hz.

Question 21. Name the scientist who discovered the relationship between electric current and magnetic field. Answer: Danish physicist, H.C. Oersted established the relation between electricity and magnetism.

Question 22. What does the closeness of field lines in a magnetic field signify? Answer: The degree of closeness of the field lines in a magnetic field indicates the strength of magnetic field in the region. The closer the field lines, the stronger is the field.

Question 23. Name the device which converts mechanical energy into electrical energy. Answer: Electric generator

Question 24. Which type of generator is used at power stations? Answer: AC generator.

Question 25. Does the AC generator have any slip ring? Answer: Yes, the AC generator has two slip rings.

Question 26. What is the frequency of DC? Answer: Zero.

Magnetic Effects of Electric Current Extra Questions Short Answer Type

Question 1. What is electromagnetic induction? Answer: Whenever the magnetic flux linked with a coil changes, an induced e.m.f. (electromotive force) is produced in the coil. This phenomenon is known as electromagnetic induction and is used to generate electric current in a generator or a dynamo.

Question 2. Write SI unit of magnetic field. Under what condition does a moving charge experience (i) maximum force (ii) minimum force? Answer: The SI unit of magnetic field is tesla. (i) Maximum force: When the velocity of charge and the magnetic field are perpendicular to each other. (ii) Minimum force: When this charge is moving in the direction of the magnetic field.

Question 3. What is an electromagnet? Answer: The magnetic field produced due to current flowing in a coil or a solenoid can be used to magnetise a material like soft iron temporarily. The insulated copper wire is wrapped on a soft iron piece. When current is passed through the coil using a battery and a key the iron piece behaves like a bar magnet as long as current is being passed. Such a magnet is called an electromagnet.

Question 4. A magnetic compass shows a deflection when placed near a current-carrying wire. How will the deflection of the compass get affected if the current in the wire is increased? Support your answer with a reason. Answer: If the current in the wire is increased, the deflection increases. The strength of magnetic field is directly proportional to the magnitude of current passing through the straight conductor.

Question 5. What does the divergence of magnetic field lines near the ends of a current carrying straight solenoid indicate? Answer: The divergence, that is, the falling degree of closeness of magnetic field lines indicates the fall in strength of magnetic field near and beyond the ends of the solenoid.

Question 6. A student performs an experiment to study the magnetic effect of current around a current carrying straight conductor with the help of a magnetic compass. He reports that (i) the degree of deflection of the magnetic compass increases when the compass is moved away from the conductor. (ii) the degree of deflection of the magnetic compass increases when the current through the conductor is increased. Which of the above observation of the student appears to be wrong and why? Answer: The first observation is wrong. Because as the distance from the conductor increases, the strength of the magnetic field will decrease. So the degree of deflection of the compass should decrease instead of increasing.

Question 7. How does the strength of the Magnetic field at the centre of a circular coil of a wire depend on: (a) radius of the coil (b) number of turns in the coil. Answer: (a) More the radius weakere the field. (b) Field strength is directly proportional to the number of turns in the coil.

Question 8. (i) How is the direction of magnetic field at a point determined? (ii) What is the direction of magnetic field at the centre of a current-carrying circular loop? Answer: (i) The direction of the magnetic field at a point can be found by placing a small magnetic compass at that point. The north end of the needle of a compass indicates the direction of magnetic field at a point where it is placed. (ii) The direction of magnetic field at the centre of a current-carrying circular loop is perpendicular to the plane of the loop.

Question 9. What is the difference between a direct current and an alternating current? How many times does AC used in India change direction in one second? Answer: Direct current always flows in one direction but the alternating current reverses its direction periodically. Also the magnitude of current in case of DC is same throughout whereas in case of AC, it changes continuously. The frequency of AC in India is 50 Hz and in each cycle it alters direction twice. Therefore, AC changes direction 2 × 50 = 100 times in one second.

Question 10. How can the magnitude of the induced current in a coil be increased? Answer: The magnitude of the induced current can be increased by:

Increasing the number of turns in the coil.
Increasing the strength of the magnetic field used.
Increasing the rate of change of magnetic flux associated with the coil.

Question 11. What is the role of fuse used in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with a larger rating? Answer: Fuse is used for protecting appliances due to short-circuiting or overloading. The fuse is rated for a certain maximum current and blows off when a current more than the rated value flows through it. If a fuse is replaced by one with larger ratings, the appliances may get damaged while the protecting fuse does not burn off. This practice of using fuse of improper rating should always be avoided.

Question 12. Answer the following questions: (i) What is the direction of magnetic field lines outside a bar-magnet? (ii) The magnetic field lines in a given region are getting crowded. What does it indicate? (iii) State one advantage of AC over DC. Answer: (i) North pole to south pole. (ii) The strength of magnetic field is higher in this region. (iii) A.C. voltage can be stepped up and transmitted over long distances without much loss of energy.

Question 13. What are magnetic field lines? How is the direction of a magnetic field at a point determined? Mention two important properties of magnetic field lines. Answer: The magnetic field lines of force are the lines drawn in a magnetic field along which a hypothetical north magnetic pole would move if it is free to do so. The direction of a magnetic field at a point is in the direction of the resultant force acting on a hypothetical north pole placed at that point.

The tangent at any point on the magnetic field line gives the direction of magnetic field at that point. The direction of the magnetic field at a point can be found by placing a small magnetic compass at that point. The north end of the needle indicates the direction of the field.

Two important properties of the magnetic lines of force are: (i) The magnetic lines of force start from north pole and terminate at south pole. Inside the magnet they travel from south pole to north pole. Thus, they are closed curves. (ii) They do not intersect each other because at the point of intersection there will be two directions of same magnetic field which is impossible.

Question 14. A copper coil is connected to a galvanometer. What would happen if a bar magnet is: (i) pushed into the coil with its north pole entering first (ii) held at rest inside the coil (iii) pulled out again? Answer: (i) When north pole is pushed into the coil, a momentary deflection is observed in the galvanometer. This deflection indicates that a momentary current is produced in the coil. The direction of current in the coil is anticlockwise. When seen from the end from where the magnet was pushed in. (ii) When the magnet is held at rest, there is no deflection in the galvanometer. It indicates that no current is produced in the coil in this case. (iii) In pulling the magnet out of the coil, a deflection in opposite direction is observed. It indicates that the current produced in the coil is in opposite direction.

Question 15. Explain what is short circuiting and overloading in an electric supply. Answer: Short circuting: Whenever live and neutral wires come in contact with each other, the incident is called short circuiting. In this case, resistance of a circuit decreases to a very small value. The decreasing of resistance increases the current. Due to this increased current, the wires get heated. This extreme heat may cause fire in the building.

Overloading: Every supply has a capacity to bear a maximum load, i.e., the power that can be supplied has a limit. Sometimes, the number of appliances which are switched on at the same time have power more than the capacity of the line. This is called overloading. In this situation, wires of the supply get heated due to extremely large current flowing through them and the circuit may catch fire. To avoid this fire, we use an electric fuse in the circuit.

Question 16. What change in the deflection of the compass needle placed at a point near current carrying straight conductor shall be observed if the (a) current through the conductor is increased? (b) direction of current in the conductor is reversed? (c) compass is moved away from the conductor? Answer: (a) Deflection increases. (b) Direction of deflection is reversed. (c) Deflection decreases.

Magnetic Effects of Electric Current Class 10 Extra Questions with Answers Science Chapter 13 2

Question 18. A coil made of insulated copper wire is connected to a galvanometer. What will happen to the deflection of the galvanometer if this coil is moved towards a stationary bar magnet and then moved away from it? Give reason for you answer and name the phenomenon involved. Answer: When coil is moved towards a stationary magnet, the magnetic field associated with the coil will change and so current will be induced in the coil. The causes galvanometer to show deflection in one direction. Now when coil is moved away, the magnetic field will decrease and so current induces in the opposite direction causing galvanometer to show deflection in opposite direction. The phenomenon is electromagnetic induction.

Question 19. In what respect does the construction of an AC generator differ from that of a DC generator? Answer: The only difference between a DC generator and an AC generator is in the way the two ends of the generator coil are connected to the outer circuit. In a DC generator, the two ends of the generator coil are connected to a split ring type commutator consisting of two half rings of copper. In an AC generator, the ends of the coil are connected to two full rings of copper called slip rings. There is no commutator in an AC generator.

Magnetic Effects of Electric Current Extra Questions Long Answer Type

Magnetic Effects of Electric Current Class 10 Extra Questions with Answers Science Chapter 13 3

Take a drawing sheet and fix it on a smooth table with adhesive tape.
Place a bar magnet in the middle of the drawing sheet and draw its boundary with a sharp pencil.
Place a magnetic compass near one end of the magnetc (N-pole) and mark the positions of the two ends (N and S-poles) of the compass needle using a sharp pencil.
Shift the compass from this position and place it in such a way that S-pole of its needle is on the point you marked in previous step for N-pole.
Again mark the position of the other end (N-pole) of the compass needle.
Repeat the steps 4 and 5, till you reach the other end (S-pole) o the bar magnet.
Joint all the points with a sharp pencil to get a smooth curve.
Put the compass at some other points near the N-pole of the magnet and draw another magnetic field lines. Similarly, draw many field lines on both the sides of the bar magnet as shown in figure.
Observe the pattern of the magnetic field lines.

Result: Magnetic field lines can be drawn around a bar magnet using a magnetic compass. The field lines do not cross each other. Region A has stronger magnetic field. This is due to the strength of the field is proportional to the relative closeness of field lines.

Question 2. Draw a labelled circuit diagram of a simple electric motor and explain its working. In what way these simple electric motor are different from commercial motors? Answer: An electric motor is a device which converts electrical energy into mechanical energy. Principle The electric motor works on the magnetic effect of current. Its principle is when a rectangular coils is placed in a magnetic field and current is passed through it, a force acts on the coil, due to which the coil rotates. When the coil rotates the shaft attached to it also rotates. The rotating shaft has mechanical energy. In this way electric energy supplied to motor is converted into mechanical energy.

Construction: An electric motor has the following parts: 1. Field Magnet: Itis a permanent U-shaped magnet NS; whose north and south poles are N and S respectively. 2. Armature: It is a rectangular coil ABCD which contains a large number of turns of insulated copper wire wound on a soft iron core. This coil is free to rotate between the pole pieces of the magnet. 3. Split Rings and Brushes: Split rings (X and Y) are simply a brass (or copper) ring which is divided into two parts. These both parts are separated from each other and are soldered to the two ends of the coil. These split rings are mounted on the shaft of the motor and can rotate with the shaft.

The split rings touch the two strips of graphite B1, B2; these strips of graphite are called the brushes. These brushes are connected to two connecting screws P and Question These brushes are fixed to the base of the motor and they keep contact with the half rings lightly. The screws are connected to terminals of battery. When current is passed by means of battery, the current enters the coil from one brush and leaves through the other.

Magnetic Effects of Electric Current Class 10 Extra Questions with Answers Science Chapter 13 4

By Fleming’s left hand rule, the force on arm AB of coil is vertically downward and on side CD of coil, it is vertically upward. These two forces are equal and opposite and hence form a couple. This tends to rotate the coil in anticlockwise direction. When rotating coil becomes perpendicular to its initial position, then couple becomes zero. But due to inertia the coil Magnet continues to rotate along the same direction.

As the split rings also rotate with the coil, therefore, the split rings come in contact with other Brush brushes. [That is initially B1 had contact with X and B2 had contact with Y; now B1 has contact Split Rings or Phase Converter with has contact with X.] When this happens the direction of current in the coil is reversed.

This in turn reverses the direction of forces in AB and CD. The side of the coil will be on left hand side with a downward force on it and the side AB of coil will be on right hand side with an upward force on it. Thus a couple acts on the coil which rotates the coil in the same direction (anti-clockwise). This process is repeated again and again and the coil rotates continuously.

Due to rotation of coil, its shaft gains kinetic energy; which may be used to run electric fan, water pump, washing machine, mixer and grinder etc.

Question 3. (i) Two circular coils P and Q are kept close to each other, of which coil P carries a current. If coil P is moved towards Q, will some current be induced in coil Q? Give reason for your answer and name the phenomenon involved. (ii) What happens if coil P is moved away from Q? (iii) State any two methods of inducing current in a coil. Answer: (i) When coil P is moved towards Q, current will be induced in coil Question This is because on moving P the magnetic field associated with Q increases and so a current is induced. The phenoemenon is electromagnetic induction. (ii) If P is moved away from Q, the field associated with Q will decrease and a current will be induced but in the opposite direction. (iii) Current can be induced in a coil by (a) moving a magnet towards or away from the coil, (b) moving a coil towards or away from a magnet (c) rotating a coil witin a magnetic field.

Question 4. Explain the underlying principle and working of an electric generator (or dynamo) by drawing a labelled diagram. What is the function of brushes? Answer: Principle of electric generator. Electric generator is based on the phenomenon of electromagnetic induction i.e., a changing magnetic field in a conductor induces an electric current in the conductor. Direction of the induced current is given by Fleming’s right hand rule. In an electric generator, the magnetic field in the conductor is changed by moving the conductor in the magnetic field of the magnet.

Magnetic Effects of Electric Current Class 10 Extra Questions with Answers Science Chapter 13 5

After half a rotation, now CD starts moving up and AB moves down. As a result, the direction of induced current in the arms AB and CD changes. This gives rise to induced current in the direction DCBA and the current in the external circuit will flow in the opposite direction.

Thus, after every half a rotation, the polarity of the current in the arms AB and CD changes. Such a current which changes direction after equal intervals of time is called an alternating current. Since this electric generator producing alternating current, it is also called A.C. generator.

Function of the brushes: The carbon brushes are fixed while slip rings rotate along with the armature. These brushes are connected to the load through which the output is obtained.

Magnetic Effects of Electric Current Extra Questions Numerical Type

Question 1. A Coil of wine having area 0.9 m 2 is placed in a uniform magnetic field 2 × 10 -2 weber/m 2 . What will be the magnetic flux associated with the coil, if the plane of the coil is (i) along the magnetic field (ii) Perpendicular to the magnetic field? Answer: Given: A = 0.9 m 2 , B = 2 × 10 -2 Wb/m 2 (i) θ = 90°, Ø = ? Ø = BA cosθ = 2 × 10 -2 × 0.9 × cos 90° – 0 (ii) θ = 0°, Ø = ? $ = BA cosθ = 2 × 10 -2 × 0.9 × cos 0° = 1.8 × 10 -2 Wb

Question 2. A Charge 3.2 × 10 -19 C moving with velocity 10 6 m/sec enters in a magnetic field of intensity 3 meber/m 2 at are angle of 60°. Calculate the force acting on the charge. Write the necessary law for finding the direction of magnetic force acting on a moving charge particle in a magnetic field. Answer: Given: q = 3.2 × 10 -19 C, v = 10 6 m/sec, B = 3 wb/m 2 θ = 60°, F = ? F = Bqv sinθ = 3 × 3.2 × 10 -19 × 10 6 × sin 60° = 9.6 × 10 -13 × $\frac{\sqrt{3}}{2}$ = 8.31 × 10 -13 N. Fleming’s left hand rule.

Question 3. A current of 1 ampere is flowing through a conductor of length 1 m. It is placed in 2 N/A m magnetic field. Calculate the force acting on the conductor when (i) The conductor is perpendicular to the field (ii) The conductor is parallel to the field (iii) The conductor is mapping an angle of 60° with the direction of magnetic field. Answer: Given: i= 1A, l = 1 m, B = 2 N/A-m (i) θ = 90°, F = ? F = ilB sinθ = 1 × 1 × 2 sin 90° = 2 N (ii) θ = 0°, F = ? F = il B sinθ = 1 × 1 × 2 × sin 0° = 0 (iii) θ = 60°, F = ? F = ilB sinθ = 1 × 1 × 2 × sin 60° = 2 × $\frac{\sqrt{3}}{2}$ = ∈3 = 1.732 N

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Magnetic Effects of Electric Current

Ncert revision notes for chapter 13 magnetic effects of electric current class 10 science.

→ Magnet is any substance that attracts iron or iron-like substances.

→ An electric current-carrying wire behaves like a magnet.

→ Electromagnets and electric motors involve the magnetic effect of electric current, and electric generators involve the electric effect of moving magnets.

→ Compass needle get deflected on passing an electric current through a metallic conductor.

(i) Every magnet has two poles i.e. North and South.

(ii) Like poles repel each other.

(iii) Unlike poles attract each other.

(iv) A freely suspended bar magnet aligns itself in nearly north-south direction, with its north pole towards north direction.

Characteristics of Field Lines

→ Field lines arise from North pole and end into South pole of the magnet.

→ Field lines are closed curves.

→ Field lines are closer in stronger magnetic field.

→ Field lines never intersect each other as for two lines to intersect, there must be two north directions at a point, which is not possible.

→ Direction of field lines inside a magnet is from South to North.

→ The relative strength of magnetic field is shown by degree of closeness of field

Magnetic Field of a Bar Magnet

→ H. C. Oersted was the first person to state that electric current has magnetic field.

→ Imagine you are holding a current carrying straight conductor in your right hand such

that the thumb is pointing towards the direction of current.

→ Then the fingers wrapped around the conductor give the direction of magnetic field.

→ It can be represented by concentric circles at every point on conductor.

→ Direction can be given by right hand thumb rule or compass.

→ Circles are closer near the conductor.

→ Magnetic field ∝ Strength of current.

→ Magnetic field ∝ 1/Distance from conductor

→ It can be represented by concentric circle at every point.

→ Circles become larger and larger as we move away.

→ Every point on wire carrying current would give rise to magnetic field appearing as straight line at center of the loop.

→ The direction of magnetic field inside the loop is same.

Factors affecting magnetic field of a circular current carrying conductor

→ Magnetic field ∝ Current passing through the conductor

→ Magnetic ∝ 1/Distance from conductor

→ Magnetic field ∝ No. of turns in the coil

→ Magnetic field is additive in nature i.e., magnetic field of one loop adds up to magnetic field of another loop. This is because the current in each circular turn has some direction.

→ A coil of many circular turns of insulated copper wire wrapped closely in a cylindrical form.

→ Magnetic field of a solenoid is similar to that of a bar magnet.

→ Magnetic field is uniform inside the solenoid and represented by parallel field lines.

Direction of magnetic field

(i) Outside the solenoid: North to South

(ii) Inside the solenoid: South to North

→ Solenoid can be used to magnetise a magnetic material like soft iron.

→ It is a temporary magnet, so, can be easily demagnetised.

→ Strength can be varied.

→ Polarity can be reversed.

→ Generally strong magnet.

→ Cannot be easily demagnetised.

→ Strength is fixed.

→ Polarity cannot be reversed.

→ Generally weak magnet.

Andre Marie Ampere suggested that the magnet also exerts an equal and opposite force

on a current carrying conductor.

→ The displacement in the conductor is the maximum when the direction of current is at right angle to the direction of magnetic field.

→ Direction of force is reversed on reversing the direction of current.

→ Stretch the thumb, fore finger and middle finger of your left hand such that they are mutually perpendicular.

→ If fore finger points in the direction of magnetic field, middle finger in the direction of current then thumb will point in the direction of motion or force.

→ Heart and brain in the human body have significant magnetic field.

• MRI (Magnetic Resonance Imaging): Image of internal organs of body can be obtained using magnetic field of the organ.

• Galvanometer: Instrument that can detect the presence of current in a circuit. It also detects the direction of current.

→ An electric motor is a rotating device that converts electrical energy to mechanical energy.

→ An electric motor consists of a rectangular coil ABCD of insulated copper wire. The coil is placed between the two poles of a magnetic field such that the arm AB and CD are perpendicular to the direction of the magnetic field.

→ The ends of the coil are connected to the two halves P and Q of a split ring. The inner sides of these halves are insulated and attached to an axle.

→ The external conducting edges of P and Q touch two conducting stationary brushes X and Y, respectively.

→ Current in the coil ABCD enters from the source battery through conducting brush X and flows back to the battery through brush Y.

→ The force acting on arm AB pushes it downwards while the force acting on arm CD pushes it upwards.

→ Thus the coil and the axle O, mounted free to turn about an axis, rotate anti-clockwise.

→ At half rotation, Q makes contact with the brush X and P with brush Y. Therefore the current in the coil gets reversed and flows along the path DCBA.

→ The split ring acts as a commutator which reverse the direction of current and also reverses the direction of force acting on the two arms AB and CD.

→ Thus the arm AB of the coil that was earlier pushed down is now pushed up and the arm CD previously pushed up is now pushed down.

→ Therefore the coil and the axle rotate half a turn more in the same direction. The reversing of the current is repeated at each half rotation, giving rise to a continuous rotation of the coil and to the axle.

• Commutator: A device that reverses the direction of flow of current through a circuit is called a commutator.

• Armature: The soft iron core, on which the coil is wound including the coils is called armature. It enhances the power of the motor.

Commercial use of motors

(i) an electromagnet in place of permanent magnet

(ii) large number of turns of the conducting wire in the current-carrying coil

(iii) a soft iron core on which the coil is wound.

→ When a conductor is placed in a changing magnetic field, some current is induced in it.

→ Such current is called induced current and the phenomenon is called electromagnetic induction.

Activity No. 1

(i) Magnet moved into the coil: Momentary deflection in G indicating presence of current.

(ii) Magnet kept stationary inside the coil: No deflection.

(iii) Magnet is withdrawn: Momentary deflection in G but in opposite direction of first case.

Activity No. 2

(i) Switched on: Momentary deflection in G.

(ii) Steady current: No deflection.

(iii) Switched off: Momentary deflection in G but in opposite direction of the first case.

→ Hold the thumb, the fore finger and the middle finger of right hand at right angles to each other.

→ If the fore finger is in the direction of magnetic field and the thumb points in the direction of motion of conductor, then the direction of induced current is indicated by middle finger.

• Working principle of electric generator.

• Used to find direction of induced current.

→ An electric generator, mechanical energy is used to rotate a conductor in a magnetic field to produce electricity.

→ An electric generator consists of a rotating rectangular coil ABCD placed between the two poles of a permanent magnet.

→ The two ends of this coil are connected to the two rings R 1 and R 2 . The inner side of these rings are made insulated.

→ The inner side of these rings are made insulated. The two conducting stationary brushes B 1 and B 2 are kept pressed separately on the rings R 1 and R 2 , respectively.

→ The two rings R 1 and R 2 are internally attached to an axle. The axle may be mechanically rotated from outside to rotate the coil inside the magnetic field.

→ Outer ends of the two brushes are connected to the galvanometer to show the flow of current in the given external circuit.

→ When the axle attached to the two rings is rotated such that the arm AB moves up (and the arm CD moves down) in the magnetic field produced by the permanent magnet.

→ After half a rotation, arm CD starts moving up and AB moving down. As a result, the directions of the induced currents in both the arms change, giving rise to the net induced current in the direction DCBA.

→ The current in the external circuit now flows from B 1 to B 2 . Thus after every half rotation the polarity of the current in the respective arms changes.

• To get a direct current (DC) , a split-ring type commutator must be used. With this arrangement, one brush is at all times in contact with the arm moving up in the field, while the other is in contact with the arm moving down.

• The direct current always flows in one direction, whereas the alternating current reverses its direction periodically.

→ The current which reverses its direction periodically.

→ In India, A. C. reverses its direction in every 1/100 second.

Time period = 1/100 + 1/100 = 1/50 s

Frequency = 1/time period = 1/50 = 50 Hz

Advantage of A.C.

→ A. C. can be transmitted over long distance without much loss of energy.

Disadvantage of A.C.

→ A. C. cannot be stored.

→ The current which does not reverse its direction.

→ D. C. can be stored.

→ Loss of energy during transmission over long distance is high.

→ Sources of D. C.: Cell, Battery, Storage cells.

→ There are three kinds of wires used:

(i) Live wire (positive) with red insulation cover.

(ii) Neutral wire (negative) with black insulation cover.

(iii) Earth wire with green insulation cover.

→ The potential difference between live and neutral wire in India is 220 V.

→ Pole ⇒ Main supply ⇒ Fuse ⇒ Electricity meter ⇒ Distribution box ⇒ To separate circuits

• Earth Wire: Protects us from electric shock in case of leakage of current especially in metallic body appliances. It provides a low resistance path for current in case of leakage of current.

• Short Circuit: When live wire comes in direct contact with neutral wire accidentally. The resistance of circuit becomes low which can result in overloading.

• Overloading: When current drawn is more than current carrying capacity of a conductor, it results in overloading.

Causes of overloading

(i) Accidental hike in voltage supply.

(ii) Use of more than one appliance in a single socket.

Safety devices

(i) Electric fuse

(ii) Earth wire

(iii) MCB (Miniature Circuit Breaker)

NCERT Solutions for Chapter 4 The Age of Industrialisation Class 10 History

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CBSE- Magnetic Effects of Electric Current
Sample Questions

Magnetic Effects of Electric Current-Sample Questions

STUDY MATERIAL FOR CBSE CLASS 10 PHYSICS
Chapter 1 - Electricity
Chapter 2 - Human Eye and the Colourful World
Chapter 3 - Light- Reflection and Refraction
Chapter 4 - Magnetic Effects of Electric Current
Chapter 5 - Sources of Energy

CBSE Class 10
Class 10 Science MCQs
CBSE Class 10 Science MCQ Chapter 13 Magnetic Effects Of Electric Current

CBSE Class 10 Science MCQ Chapter 13 Magnetic Effects of Electric Current

Magnetic effects of electric current class 10 mcq.

CBSE Class 10 Science MCQ Chapter 13 Magnetic Effects of Electric Current can be used by the students to enhance their conceptual knowledge. These Magnetic Effects of Electric Current MCQs are created by the subject-matter experts at BYJU’S after thorough research on exam patterns as per the latest CBSE syllabus. Moreover, these questions cover the CBSE Class 10 Science Syllabus and important concepts. Students can download the CBSE Class 10 Science MCQ Chapter 13 Magnetic Effects of Electric Current PDF with answers from the link below.

Download CBSE Class 10 Science MCQ Chapter 13 Magnetic Effects of Electric Current with Answer PDF

Students must learn the following concepts from the NCERT Class 10 Science Textbook before solving these multiple-choice questions to answer them correctly.

Magnetic field and field lines
Magnetic field due to a straight current carrying conductor
Magnetic field due to a current carrying circular loop
Magnetic field due to a current carrying solenoid
Force-carrying conductor in a magnetic field
Electric motor
Electromagnetic induction
Electric generator
Domestic electric circuits

Students can also access the CBSE Class 10 Science MCQs for other chapters to prepare for the Class 10 board exams well.

CBSE Class 10 Science MCQ Chapter 13 Magnetic Effects of Electric Current with Answers

Q1) The most suitable material for making the core of an electromagnet is:

c) Soft iron

d) Aluminium

Correct Answer: Option (c)

Q2) Which of the following is not attracted by a magnet?

Q3) When a straight conductor is carrying current:

a) There are circular magnetic field lines around it

b) There are magnetic field lines parallel to the conductor

c) There are no magnetic field lines

d) None of the above

Correct Answer: Option (a)

Q4) A plotting compass is placed near the south pole of a bar magnet. The pointer of the plotting compass will:

(a) Point away from the south pole

(b) Point parallel to the south pole

(d) Point at right angles to the south pole

Q5) Two magnetic field lines:

a) Intersect at the neutral point

b) Never intersect each other

c) Intersect near north-pole or south pole

d) Intersect at the midpoint of the magnet

Correct Answer: Option (b)

Q6) A student learns that magnetic field strength around a bar magnet is different at every point. Which diagram shows the correct magnetic field lines around a bar magnet?

CBSE Class 10 Science MCQ Chapter 13 Magnetic Effects of Electric Current-1

Q7) The front face of a circular loop of a wire is the North Pole, the direction of current in this face of the loop will be:

a) Clockwise

b) Anticlockwise

c) Towards North

d) Towards South

Q8) Which of the following statements is incorrect regarding magnetic field lines?

(a) The direction of the magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points.

(b) Magnetic field lines are closed curves.

(d) Relative strength of the magnetic field is shown by the degree of closeness of the field lines.

Q9) The magnetic field inside a long straight solenoid carrying current:

b) Decrease as we move towards its end

c) Is the same at all points

d) Increase as we move towards its end

Q10) A strong bar magnet is placed vertically above a horizontal wooden board. The magnetic lines of force will be:

(a) Only in the horizontal plane around the magnet

(b) Only in the vertical plane around the magnet

(d) In all the planes around the magnet

Correct Answer: Option (d)

Q11) A student places some iron filings around a magnet. The iron fillings arrange themselves as shown in the image.

CBSE Class 10 Science MCQ Chapter 13 Magnetic Effects of Electric Current-2

The student labelled four different regions around the magnet. Where would the magnetic field be the strongest?

Q12) The strength of the magnetic field inside a long current carrying straight solenoid is:

a) More at the ends than at the centre

b) Minimum in the middle

c) Same at all points

d) Found to increase from one end to the another

Q13) Which option explains Fleming’s left-hand rule to understand the working of a motor?

(a) When a current-carrying conductor is moved with force, it creates a magnetic field.

(b) When a conductor is moved inside a magnetic field, the current is produced in the conductor.

(d) When a current-carrying conductor is placed in a magnetic field, it experiences a force from the magnetic field.

Q14) The force on a current-carrying conductor when placed perpendicular in a uniform magnetic field.

Q15) A student inserts a bar magnet in the coil. The student observes deflection in the galvanometer connected to the coil. What will happen if the magnet is continuously getting in and out of the coil?

(a) The current induced in the coil will increase

(b) The current will change its direction continuously

(d) The magnetic field of the bar magnet would keep decreasing

Q16) A metal rod PQ is placed in the magnetic field. The ends of the rod are connected to a battery using wires.

CBSE Class 10 Science MCQ Chapter 13 Magnetic Effects of Electric Current-3

Where will the rod move?

(b) Downwards

(d) Out of the field

Q17) A soft iron bar is introduced inside a current-carrying solenoid. The magnetic field inside a solenoid:

a) Decrease

b) Will increase

c) Will become zero

d) Will remain unaffected

Q18) Assertion (A): As the speed of the coil in the motor increases, there is a reduction in the current flowing through it.

Reason (R): During rotation in an electric motor, some induced current is produced.

(a) (A) is incorrect and (R) is correct

(b) (A) is correct and (R) is incorrect

(d) Both (A) and (R) are correct but (R) is the correct explanation of (A)

Q19) Which of the following correctly describes the magnetic field near a long straight wire?

a) The field consists of straight lines perpendicular to the wire

b) The field consists of straight lines parallel to the wire

c) The field consists of radial lines originating from the wire

d) The field consists of concentric circles centred on the wire

Q20) For a current in the long straight solenoid, N and S-poles are created at the two ends. Among the following statement, the incorrect statement is:

a) The field lines inside the solenoid are in the form of straight lines, which indicates that the magnetic field is the same at all points inside the solenoid

b) The strong magnetic field produced inside the solenoid can be used to magnetise a piece of a magnetic material like soft iron when placed inside the coil

c) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet.

d) The N and S-poles exchange position when the direction of the current through the solenoid is reversed

Q21) A student makes an arrangement to study electromagnetic induction, as shown.

CBSE Class 10 Science MCQ Chapter 13 Magnetic Effects of Electric Current-4

She changes the arrangement in four different ways.

Moves the coil to the left, away from the magnet
Moves the magnet to the right, away from the coil
Moves both coil and magnet towards each other
Moves both coil and magnet in the same direction at the same speed

In which trial would the galvanometer remain undeflected?

(a) Trial 1

(b) Trial 2

(d) Trial 4

Q22) Appliances that have a metal body are generally connected to the earthing wire. What is the reason to earth these wires?

(a) To prevent the excess current

(b) To prevent the leakage of current

(d) To provide high resistance to the appliance

Frequently Asked Questions on Magnetic Effects of Electric Current

To avoid the risk of electric shock, which phenomenon is used.

To avoid the risk of electric shock, earthing is used.

Which rule determines the direction of the magnetic field due to a current-carrying conductor?

Maxwell’s cork screw rule determines the direction of the magnetic field due to a current-carrying conductor.

You are looking into a solenoid at its S-pole, along its axis. From your viewpoint, the direction of the current in the solenoid is …………..

The direction of the current in the solenoid is clockwise.

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Case Study Questions Class 10 Science Magnetic Effects of Electric Current
CBSE Case Study Questions Class 10 Science Magnetic Effects of Electric Current. Case Study - 1. Andre Marie Ampere suggested that a magnet must exert an equal and opposite force on a current carrying conductor, which was experimentally found to be true. But we know that current is due to charges in motion.
Case Study Questions Class 10 Science Chapter 13 Magnetic Effects of
Here, we have provided case-based/passage-based questions for Class 10 Science Chapter 13 Magnetic Effects of Electric Current. Case Study/Passage Based Questions. Question 1: An electric motor is a rotating device that converts electrical energy into mechanical energy electric motors are used as an important component in electric fans ...
Case Study Questions for Class 10 Science Chapter 13 Magnetic Effect of
Case Study Questions for Class 10 Science Chapter 13 Magnetic Effect of Electric Current Question 1: A student wants to study the working of electric motor. He used a model of DC motor for electromagnetism as shown in figure. He fixed the two ends of the coil to a pair of curved elastic metal strips. … Continue reading Case Study Questions for Class 10 Science Chapter 13 Magnetic Effect of ...
Case Study Chapter 13 Magnetic Effect of Electric Current
Case Study Questions Chapter 13 Magnetic Effect Of Electric Current. Case/Passage - 1. A solenoid is a long helical coil of wire through which a current is run in order to create a magnetic field. The magnetic field of the solenoid is the superposition of the fields due to the current through each coil. It is nearly uniform inside the ...
CBSE 10th Science Magnetic Effects of Electric Current Case Study
CBSE 10th Standard Science Subject Magnetic Effects of Electric Current Case Study Questions With Solution 2021. An insulated copper wire wound on a cylindrical cardboard tube such that its length is greater than its diameter is called a solenoid. When an electric current is passed through the solenoid, it produces a magnetic field around it.
Class 10 Science Chapter 12 Case Based Questions
Case study - 3. The change in electric current through the circuit produces magnetic field around it. Magnetic field is a vector quantity which has both magnitude as well as direction. The magnetic field lines produced are directed from north pole and ends at south pole. These lines are closed curves from which strength of the magnetic field is ...
Magnetic Effects of Electric Current Case Study Based Questions Class 10
These questions are asked in the Multiple Choice Questions (MCQ). These case based questions are a type of open book test. These case based questions can help students to score well in the particular subject. These Magnetic Effects of Electric Current Case Study Based Questions can also be asked in the form of CBSE Assertion and Reason.
Magnetic effects of electric current
Learn. Magnetic effects of electric current: CBSE board practice. Level up on all the skills in this unit and collect up to 1,200 Mastery points! Magnets are fun and mysterious. But they can do a lot more than just push and pull each other from a distance. In this chapter, we will learn about the intimate relationship between magnets and ...
CBSE Class 10 Science Chapter 13 Magnetic Effects of Electric Current
This will help them to formulate a proper strategy during the science exam preparation. The students can now download the free PDF of Magnetic effect of electric current class 10 important questions from the website of Vedantu easily. Vedantu is a platform that provides free CBSE Solutions (NCERT) and other study materials for students.
Magnetic effects of electric current: CBSE board practice
This electricity is caused due to the Magnetic Field, and there is also a law for conversion of energy, that is energy can be transferred. Think of it as Potential Energy transferred to Kinetic Energy. These energy transfers occur all along in the process. When the magnet comes closer, the Pot (short for Potential) Energy transfers to Kin ...
Magnetic Effects of Electric Current Class 10 Important Questions with
Answer: (a) Refer to answer 1. Necessary parameters are: Magnitude of magnetic field. Direction of field lines. (b) If field lines of a magnetic field are crossed at a point, it indicates that there are two direction of magnetic field at a point which is not possible. Question 6.
Class 10th Science
QB365 provides a detailed and simple solution for every Possible Case Study Questions in Class 10 Science Subject - Magnetic Effects of Electric Current, CBSE. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.
NCERT Exemplar Class 10 Science Solutions Chapter 13
Chapter 13 in the Class 10 Science Textbook deals with the study of magnetic fields and electromagnetic effects. In this chapter, students will study about electromagnets, electric motors, electric generators and the magnetic effect of electric current as well as moving magnets. However, the main objective of the chapter is to help students ...
NCERT Solutions for Class 10 Science Chapter 13 Magnetic Effects of
Magnetic Effects Of Electric Current Class 10 NCERT questions and answers were solved by the best academic experts in order to help you a better understanding. So the candidates who want to secure a decent grade in class 10 board exams can refer to this article and solve magnetic effect of electric current science class 10 NCERT solutions.
Magnetic Effect of Electric Current Class 10 Science Extra Questions
Magnetic Effect of Electric Current Class 10 Science Extra Questions with Answers. Question 1: Name the type of current: (a) used in household supply. (b) given by a cell. Answer: (a) Alternating current. (b) Direct current. Question 2: State the direction of magnetic field in the following case.
Magnetic Effects of Electric Current Class 10 Extra Questions with
Magnetic Effects of Electric Current Extra Questions Short Answer Type. Question 1. What is electromagnetic induction? Answer: Whenever the magnetic flux linked with a coil changes, an induced e.m.f. (electromotive force) is produced in the coil.
NCERT Solutions for Class 10 Science Chapter 13 Magnetic Effects of
Solution: The working principle of an electric motor is based on the magnetic effect of current. A current-carrying conductor, when placed in a magnetic field, experiences force and rotates. The direction of the rotation of the conductor can be determined by Fleming's Left-hand rule. 3.
Magnetic Effects of Electric Current
→ An electric current-carrying wire behaves like a magnet. → Electromagnets and electric motors involve the magnetic effect of electric current, and electric generators involve the electric effect of moving magnets. → Compass needle get deflected on passing an electric current through a metallic conductor.
Magnetic Effect of Electric Current Questions
The magnetic effect of electric current is one of the essential effects of electric current in use, without which we would not be able to have motors in the modern world. A current-carrying conductor generates a magnetic field that can be visualised using force or magnetic field lines. 10. Write a brief note on the direct current.
Important Questions for Class 10 Science Chapter 13
Multiple Choice Questions. 1) The strength of magnetic field inside a long current carrying straight solenoid is. (a) minimum in the middle. (b) found to increase from one end to the other. (c) same at all points. (d) more at the ends than at the centre. 2) Which instrument is used to determine the presence of magnetic field?
Magnetic Effects of Electric Current-Sample Questions
6. A compass needle is placed near a current carrying wire. State your observation for the following cases, and give reason for the same in each case. a. Magnitude of electric current in the wire is increased. b. The compass needle is displayed away from the wire. (CBSE (CCE) 2012) 7.
CBSE Class 10 Science MCQ Chapter 13 Magnetic Effects of Electric Current
Download CBSE Class 10 Science MCQ Chapter 13 Magnetic Effects of Electric Current with Answer PDF. Students must learn the following concepts from the NCERT Class 10 Science Textbook before solving these multiple-choice questions to answer them correctly. Magnetic field and field lines. Magnetic field due to a straight current carrying conductor.

Case Study Questions Class 10 Science Magnetic Effects of Electric Current

CBSE Case Study Questions Class 10 Science Magnetic Effects of Electric Current

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