A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2 mm / s . The induced emf in the

Question

A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2 mm / s . The induced emf in the loop when the redius is 2 cm is :NEET 2009 (Mains)

TestHub · Accepted Answer

e ​ = dt d ϕ ​ = dt d ​ ( B π r 2 ) = 2 π rB dt dr ​ = 2 × π × 2 × 1 0 − 2 × 4 × 1 0 − 2 × 2 × 1 0 − 3 = 3.2 × 1 0 − 6 π Vol = 3.2 π μ V ​

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