Entry Test MCQ :: Electromagnetic Induction

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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: Option C

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