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Q.

A conducting loop of radius R is present in a uniform magnetic field B perpendicular to the plane of the ring. If radius R varies as a function of time ‘t’ as R = R0 + t. The e.m.f induced in the loop is

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a

2πRo+tB

b

πR0+tB clockwise

c

2πRo+tB anticlock wise

d

Zero.

answer is C.

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Detailed Solution

ϵ=−dϕdt=dπR2⋅BdtπB⋅2RdRdt2πBRo+t⋅1 anticlock wire
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