A circular ring is expanding in a uniform magnetic field of 2 T, which is perpendicular to the plane of the ring such that, its radius is increasing at a rate of 2 cm/s. Induced EMF in the ring when radius is 40 cm is
A
32πmV
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B
60πmV
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C
12mV
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D
15mV
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Solution
The correct option is A32πmV |E|=dϕdt=ddtBA=ddtBπr2=2Bπrdrdt E=2×2×π×40100×2×10−2=32πmV