A coil of wire is arranged with its plan perpendicular to a uniform ma – McqOptions

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1.	A coil of wire is arranged with its plan 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
Answer» D. ?B(r22+r12)/?t

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