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Q.

A magnet is brought towards a coil speedily in the first case and slowly in the second case. Then the induced e.m.f./induced charge will be respectively

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a

More in first case / More in first case

b

More in first case/Equal in both cases

c

Less in first case/More in second case

d

Less in first case/Equal in both cases

answer is B.

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Detailed Solution

The magnitude of induced e.m.f. is directly proportional to the rate of change of magnetic flux. Induced charge doesn't depend upon time.dQ=i dt=εRdt=dϕR
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