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Q.

The variation of induced emf with time in a coil if a short bar magnet is moved along its axis, (shown in the figure) with a constant velocity is best represented as
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a

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b

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c

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d

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answer is B.

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Detailed Solution

As the bar magnet moves towards the coil, the induced emf e=−dϕ/dt is negative and as it moves away, the induced emf is positive. 

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The variation of induced emf with time in a coil if a short bar magnet is moved along its axis, (shown in the figure) with a constant velocity is best represented as