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A copper disc of diameter 20 cm makes 1200 r.p.m. about its natural axis kept parallel to a uniform magnetic field of 10-2 T. The potential difference between the centre and edge of the disc is

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a

0.628×10-3 V

b

6.28×10-3 V

c

0.628 V

d

62.8×10-3 V

answer is A.

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Detailed Solution

e=12BR2ω  where ω=2πf

e=12×10-2×0.1×0.1×2π×120060=6.28×10-3V

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