Electromagnetic Induction MCQs Mock Test of Class 12th Physics

Welcome to your Electromagnetic Induction MCQs Mock Test of Class 12th Physics

1.
Q1. Two identical coaxial coils P and Q carrying equal amount of current in the same direction are brought nearer. The current in

2.
Q2. Whenever the magnetic flux linked with an electric circuit changes, an emf is induced in the circuit. This is called

3.
Q3. Which of the following is a unit of magnetic flux?

4.
Q4. Which of the following does not use the application of eddy current?

5.
Q.5. Whenever the magnetic flux linked with an electric circuit changes, an emf is induced in the circuit. This is called

6.
Q.6. In electromagnetic induction, the induced charge is independent of

7.
Q.7. 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

8.
Q.8. According to Faraday’s law of electromagnetic induction

9.
Q.9. A moving conductor coil produces an induced e.m.f. This is in accordance with

10.
Q.10. A coil of insulated wire is connected to a battery. If it is taken to galvanometer, its pointer is deflected, because

11.
Q.11. The polarity of induced emf is given by

12.
Q.12. The self inductance of a coil is a measure of

13.
Q.13. The coils in resistance boxes are made from doubled insulated wire to nullify the effect of

14.
Q.14. Two pure inductors each of self inductance L are connected in series, the net inductance is

15.
Q.15. Same as question 4 except the coil A is made to rotate about a vertical axis (Figure). No current flows in B if A is at rest. The current in coil A, when the current in B (at t = 0) is counterclockwise and the coil A is as shown at this instant, t = 0, is

16.
Q.16. A cylindrical bar magnet is rotated about its axis (Figure). A wire is connected from the axis and is made to touch the cylindrical surface through a contact. Then

17.
Q17. Direction of current induced in a wire moving in a magnetic field is found using

18.
Q.18. Eddy currents do not cause

19.
Q.19. Two identical coaxial circular loops carry a current i each circulating in the same direction. If the loops approach each other, you will observe that the current in

20.
Q.20. 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

21.
Q.21. The self inductance associated with a coil is independent of

22.
Q.22. 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

23.
Q.23. A coil of 100 turns carries a current of 5 mA and creates a magnetic flux of 10-5 weber. The inductance is

24.
Q.24. The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a short galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was

25.
Q.25. The current flows from A to B is as shown in the figure. The direction of the induced current in the loop is

26.
Q.26. In a coil of self-induction 5 H, the rate of change of current is 2 As-1. Then emf induced in the coil is

27.
Q27. A metal conductor of length 1 m rotates vertically about one of its ends at angular velocity 5 rad s-1 . If the horizontal component of earth’s magnetism is 2 × 10-5 T, then e.m.f. developed between the two ends of the conductor is:

28.
Q.28. Two identical coaxial coils P and Q carrying equal amount of current in the same direction are brought nearer. The current in

29.
Q.29. Faraday’s laws are consequence of the conservation of

30.
Q.30. Direction of current induced in a wire moving in a magnetic field is found using

31.
Q.31. Which of the following statements is not correct?

32.
Q.32. Lenz’s law is a consequence of the law of conservation of

33.
Q.33. A solenoid is connected to a battery so that a steady current flows through it. If an iron core is inserted into the solenoid, the current will

34.
Q.34. There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then

35.
Q.35. In the given figure current from A to B in the straight wire is decreasing. The direction of induced current in the loop is A Physics MCQs for Class 12 with Answers Chapter 6 Electromagnetic Induction 2

36.
Q.36. Which of the following does not use the application of eddy current?

37.
Q.37. The north pole of a bar magnet is rapidly introduced into a solenoid at one end (say A). Which of the following statements correctly depicts the phenomenon taking place?

38.
Q.38. A metal plate can be heated by

39.
Q.39. Identify the wrong statement.

40.
Q.40. If number of turns in primary and secondary coils is increased to two times each, the mutual inductance

41.
Q.41. When the rate of change of current is unity, the induced emf is equal to

42.
Q.42. Two inductors of inductance .L each are connected in series with opposite? magnetic fluxes. The resultant inductance is (Ignore mutual inductance)

43.
Q. 43. Lenz’s law is a consequence of the law of conservation of

44.
Q.44. A magnet is moved towards a coil (i) quickly (ii) slowly, then the induced e.m.f. is

45.
Q.45. The laws of electromagnetic induction have been used in the construction of a

46.
Q.46. Two coils are placed closed to each other. The mutual inductance of the pair of coils depends upon

47.
Q.47. A square of side L metres lies in the x-y plane in a region, where the magnetic field is given by B = B0{li + 3j + 4k) T, where Bo is constant. The magnitude of flux passing through the square is

48.
Q.48. A loop, made of straight edges has six comers at A(0, 0, 0), B(L, 0, 0) C(L, L, 0), D(0, L, 0), E(0, L, L) and F(0,0, L). A magnetic field B = Bo (i+k)T is present in the region. The flux passing through the loop ABCDEFA (in that order) is

49.
Q.49. An e.m.f is produced in a coil, which is not connected to an external voltage source. This is not due to .

50.
Q.50. There are two coils A and B as shown in Figure. A current starts flowing in B as shown, when A is moved towards B and stops when A stops moving. The current in A is counterclockwise. B is kept stationary when A moves. We can infer that