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Questions  

A conducting circular loop is in a perpendicular magnetic field of induction 10–2 T. If the radius of the loop starts shrinking at a uniform rate of 1 mm/s, then the e.m.f. induced in the loop at the instant when its radius is 10 cm will be

a
1µV
b
2µV
c
πµV
d
2πµV

detailed solution

Correct option is D

E=dt;E=ddtBπr2;E=2rdrdtE=102×π×2×101×103;E=2πμv

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