A coil of wire is arranged with its plane perpendicular to a uniform m – McqOptions

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1.	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 Δt then what is the emf induced in the coil ?
A.	ωB/r22-r12/Δt
B.	ωB(r2-r1)2/Δt
C.	ωB(r22-r12)/Δt
D.	ωB(r22+r12)/Δt
Answer» D. ωB(r22+r12)/Δt

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