Electromagnetic Induction Objective Question and Answer
Electromagnetic Induction MCQ Multiple Choice Questions - Page 2 for Practice
Electromagnetic Induction MCQ Questions for Practice
31. 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?
Correct Answer is: The end A of the solenoid acquires positive potential.
32. A metal plate can be heated by
Correct Answer is: placing in a space varying magnetic field, but does not vary with time.
33. Identify the wrong statement.
Correct Answer is: Eddy current can be used to produce braking force in moving trains.
34. If number of turns in primary and secondary coils is increased to two times each, the mutual inductance
Correct Answer is: remains unchanged
35. When the rate of change of current is unity, the induced emf is equal to
Correct Answer is: total flux linked with coil
36. Two inductors of inductance .L each are connected in series with opposite? magnetic fluxes. The resultant inductance is (Ignore mutual inductance)
Correct Answer is: 3L
37. An e.m.f is produced in a coil, which is not connected to an external voltage source. This is not due to
Correct Answer is: the coil moving in a constant magnetic field.
38. Eddy currents do not cause
Correct Answer is: loss of energy
39. A wire loop is rotated in a magnetic field such that the frequency of change of direction of the induced emf is
Correct Answer is: Once per revolution
40. Which of the following is the equivalent quantity of mass in electricity?
Correct Answer is: Potential
41. What is the unit of inductance?
Correct Answer is: Volt-ampere/sec
42. What is the angle made by the plane of eddy currents with the plane of magnetic lines of force?
