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