NCERT Class 12 Chapter 6 Physics Electromagnetic Induction MCQ

NCERT Class 12 Chapter 6 Physics Electromagnetic Induction MCQ | Questions & Answers: Give your best for the NCERT Class 12 Chapter 6 Physics Electromagnetic Induction MCQ Quiz and get to know the knowledge you have in the particular area of interest. All the best!

Page 1 of 3

1. Whenever the magnetic flux linked with an electric circuit changes, an emf is induced in the circuit. This is called

A. electromagnetic induction

B. lenz’s law

C. hysteresis loss

D. kirchhoff’s laws

2. Two coils are placed closed to each other. The mutual inductance of the pair of coils depends upon

A. the rate at which currents are changing in the two coils

B. relative position and orientation of two coils.

C. the material of the wires of the coils.

D. the currents in the two coils.

3. Direction of current induced in a wire moving in a magnetic field is found using

A. Fleming’s left hand rule

B. Fleming’s right hand rule

C. Ampere’s rule

D. Right hand clasp rule

4. A constant current I is maintained in a solenoid. Which of the following quantities will not increase if an iron rod is inserted in the solenoid along its axis?

A. Magnetic field at the centre

B. Self-inductance of the solenoid.

C. Magnetic flux linked with the solenoid

D. Rate of joule heating.

5. According to Faraday’s law of electromagnetic induction

A. electric field is produced by time varying magnetic flux.

B. magnetic field is produced by time varying electric flux.

C. magnetic field is associated with a moving charge

D. None of these

6. When current in a coil changes from 5 A to 2 A in 0.1 s, average voltage of 50 V is produced. The self-inductance of the coil is

A. 1.67 H

B. 6 H

C. 3 H

D. 0.67 H

7. An e– and a p– are moving parallel to each other in a magnetic field. The magnetic force acting on the p+ is:

A. 1840 times that on e–

B. less than that of e–

C. same as that of e–

D. slightly more than that of e–

8. Whenever the magnetic flux () linked with a coil changes the emf is induced in the circuit, Thisemf lasts

A. as long as the change in flux continues

B. for a long time

C. for a short time

9. Lenz’s law is a consequence of the law of conservation of

A. charge

B. mass

C. energy

D. momentum

10. A coil having 500 sq. loops of side 10 cm is placed normal to magnetic flux which increases at a rate of 1 T/s. The induced emf is

A. 0.1 V

B. 0.5 V

C. 1 V

D. 5 V

Page 2 of 3

11. Lenz’s law of electromagnetic induction is as per law of conservation of

A. energy

B. momentum angular.

C. charge

D. electromotive force

12. The expression for the magnetic flux

CBSE Class12 Physics lectromagnetic Induction (12Q)

A. (A)

B. (B)

C. (C)

d. (D)

13. A magnet is moved towards a coil (i) quickly (ii) slowly, then the induced e.m.f. is

A. larger in case (i)

B. smaller in case (i)

C. equal in both the cases

D. llarger or smaller depending upon the radius of the coil

14. A coil of 100 turns carries a current of 5 mA and creates a magnetic flux of 10^-5 weber. The inductance is

A. 0.2 mH

B. 2.0 mH

C. 0.02 mH

D. 0.002 H

15. Which of the following will not induce an emf in a coil in the absence of an external voltage source?

A. the coil being in a time-varying magnetic field.

B. the coil moving in a time-varying magnetic field.

C. the coil moving in a constant magnetic field

D. the coil is stationary in external spatially varying magnetic field, which does not change with time.

16. A magnet is moved towards the coil (a) quickly and (b) slowly, and then the work done is

A. does not depend on the motion of the magnet.

B. smaller in case (a)

C. equal in both cases

D. larger in case

17. A current carrying infinitely long wire is kept along the diameter of a circular wire loop, without touching it, the correct statement(s) is(are)
I. The emf induced in the loop is zero if the current is constant.
II. The emf induced in the loop is finite if the current is constant.
III. The emf induced in the loop is zero if the current decreases at a steady rate

A. I only

B. II only

C. I and II

D. I, II and III

18. Lenz’s law of electromagnetic induction is as per law of conservation of

A. energy

B. momentum angular.

C. charge.

D. electromotive force.

19. A moving conductor coil produces an induced e.m.f. This is in accordance with

A. Lenz’s law

B. Faraday’s law

C. Coulomb’s law

D. Ampere’s law

20. A cylindrical bar magnet is held along the axis of a circular conducting loop. Which one of the following movements of the bar magnet will not induce a current in the loop?

A. The magnet is rotated about its own axis.

B. The magnet is moved along its length.

C. The magnet is rotated about an axis passing through its mid point and perpendicular to its length.

D. The magnet is rotated about an axis through one end and perpendicular to its length.

Page 3 of 3

21. An induced e.m.f. is produced when a magnet is plunged into a coil. The strength of the induced e.m.f. is independent of

A. the strength of the magnet

B. number of turns of coil

C. the resistivity of the wire of the coil

D. speed with which the magnet is moved

22. The current flows from A to B is as shown in the figure. The direction of the induced current in the loop is

CBSE Class12 Physics Electromagnetic Induction (22Q)

A. clockwise

B. anticlockwise

C. straight line.

D. no induced e.m.f. produced

23. What is the instrument used in Faraday’s experiment?

A. Galvanometer

B. Ammeter

C. Voltmeter

D. Meter Bridge

24. The magnetic flux () linked with a coil is related to the number (N) of turns of the coil as

CBSE Class12 Physics Electromagnetic Induction (24Q)

A. (A)

B. (B)

C. (C)

D. (D)

25. When current i passes through an inductor of self inductance L, energy stored in it is 1/2. L i². This is stored in the

A. current

B. voltage

C. magnetic field

D. electric field