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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e/2

answer is B.

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Detailed Solution

dϕdtIn first case =edϕdtrelative velocity 2v=2dϕdtI case =2e

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