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Question

In which of the following cases e.m.f. is induced? 
(i) A current is started in a wire held near a loop of wire. 

(ii) The current is switched off in a wire held near a loop of wire.

(iii) A magnet is moved through a loop of wire. 

(iv) A loop of wire is held near a magnet.


Solution

An e.m.f. is induced in the following cases:

(i) When a current is started in a wire held near a loop of wire.

(ii) The current is switched off in a wire held near a loop of wire.

(iii) A magnet is moved through a loop of wire. 

All these involve a change in magnetic flux, and hence an e.m.f. is induced.

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