A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density B. when the radius of the coil increases from r1 to r2 in time ?t then what is the emf induced in the coil ?

A. ?B(r22-r12)/?t

B. ?B(r2-r1)2/?t

C. ?B/r22-r12/?t

D. ?B(r22+r12)/?t

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