In the following figure, the magnet is moved towards the coil with a speed v and induced emf is e. If magnet and coil recede away from one another each moving with speed v, the induced emf in the coil will be
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a
e
b
2e
c
e/2
d
4e
answer is B.
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Detailed Solution
dϕdtIn frstcase =edϕdtrelative velocity 2v=2dϕdtI case =2e