Questions

A copper disc of radius 0.1 m is rotated about its centre with 10 revolutions per second in a uniform magnetic field of 0.1 Tesla with its plane perpendicular to the field. The e.m.f. induced across the radius of disc is

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π10 V

2π10 V

π×10−2V

2π×10−2V

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detailed solution

Correct option is C

e=12Bωr2=12×0.1×2π×10×(0.1)2=π×10−2V

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