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
A
e
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B
2e
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C
e/2
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D
4e
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Solution
The correct option is B 2e The magnitude of induced emf is proportional to the relative velocity between the coil and the magnet. As the velocity is doubled, the emf induced will also be doubled.