A thin circular ring of the area A is held perpendicular to a uniform magnetic field of induction B. A small cut is made in the ring and a galvanometer is connected across the ends such that the total resistance of the circuit is R. When the ring suddenly squeezed to zero areas, the charge flowing through the galvanometer is: A) BR/A B) (AB)/R C) ABR D) E2A/R2 E) None

Answer: B) (AB)/R

As we know,

Q = It


I = induced EMF/R

EMF = (-0-BA)/t

I = BA/Rt

Q = (BA/Rt) x t

Q = BA/R

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