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Q.

A short bar magnet is at rest at time t = 0. It is moved towards a solenoid with a constant velocity v up to time t = t0 after which it is moved away from the solenoid [see Fig]. 

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Which of the graphs best represents the Variation of induced emf "e" in the solenoid with time t ?

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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 is moved towards the solenoid, the induced emf e=-dϕdt is negative and as it is moved away from the solenoid, induced emf is positive.

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