A circular ring of radius r is placed in a homogeneous magnetic field perpendicular to the plane of the ring. The field B changes with time according to the equation B = Kt, where K is a constant and t is the time. The electric field in the ring is

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Kr4

Kr3

Kr2

K2r

answer is C.

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Detailed Solution

∮E⇀.dI⇀=-dϕBdtor E 2 π r=ddtK t×πr2or E=Kr2

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