Welcome to your Electromagnetic Induction MCQs Mock Test of Class 12th Physics
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Q1. Two identical coaxial coils P and Q carrying equal amount of current in the same direction are brought nearer. The current in
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Q2. Whenever the magnetic flux linked with an electric circuit changes, an emf is induced in the circuit. This is called
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Q3. Which of the following is a unit of magnetic flux?
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Q4. Which of the following does not use the application of eddy current?
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Q.5. Whenever the magnetic flux linked with an electric circuit changes, an emf is induced in the circuit. This is called
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Q.6. In electromagnetic induction, the induced charge is independent of
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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
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Q.8. According to Faraday’s law of electromagnetic induction
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Q.9. A moving conductor coil produces an induced e.m.f. This is in accordance with
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Q.10. A coil of insulated wire is connected to a battery. If it is taken to galvanometer, its pointer is deflected, because
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Q.11. The polarity of induced emf is given by
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Q.12. The self inductance of a coil is a measure of
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Q.13. The coils in resistance boxes are made from doubled insulated wire to nullify the effect of
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Q.14. Two pure inductors each of self inductance L are connected in series, the net inductance is
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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
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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
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Q17. Direction of current induced in a wire moving in a magnetic field is found using
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Q.18. Eddy currents do not cause
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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
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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
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Q.21. The self inductance associated with a coil is independent of
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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
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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
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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
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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
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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
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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:
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Q.28. Two identical coaxial coils P and Q carrying equal amount of current in the same direction are brought nearer. The current in
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Q.29. Faraday’s laws are consequence of the conservation of
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Q.30. Direction of current induced in a wire moving in a magnetic field is found using
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Q.31. Which of the following statements is not correct?
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Q.32. Lenz’s law is a consequence of the law of conservation of
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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
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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
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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
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Q.36. Which of the following does not use the application of eddy current?
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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?
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Q.38. A metal plate can be heated by
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Q.39. Identify the wrong statement.
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Q.40. If number of turns in primary and secondary coils is increased to two times each, the mutual inductance
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Q.41. When the rate of change of current is unity, the induced emf is equal to
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Q.42. Two inductors of inductance .L each are connected in series with opposite? magnetic fluxes. The resultant inductance is (Ignore mutual inductance)
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Q. 43. Lenz’s law is a consequence of the law of conservation of
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Q.44. A magnet is moved towards a coil (i) quickly (ii) slowly, then the induced e.m.f. is
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Q.45. The laws of electromagnetic induction have been used in the construction of a
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Q.46. Two coils are placed closed to each other. The mutual inductance of the pair of coils depends upon
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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
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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
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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 .
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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
