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Q.

Is it true that when a coil and magnet both are stationary, an induced emf is set up in the coil?


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a

True

b

False 

answer is B.

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Detailed Solution

The above statement is false.
It is so because an emf is induced in the coil only when the coil goes through a change in the magnetic field. Also, “the induced emf can be defined as the rate of change of the magnetic flux in a coil.” But in this case, the magnetic field is not changing; hence, there is no relative motion between them, and as a result, no emf would be induced.
The correct statement would be that when a coil and magnet are both stationary, no emf is induced in the coil.
 
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