Rankers Physics
Topic: Electromagnetic Induction
Subtopic: Faraday's Law of Electromagnetic Induction

A conducting circular loop is placed in a uniform magnetic field of inducting B tesla with its plane normal to the field. Now, radius of the loop starts shrinking at the rate (dr/dt). Then the induced e.m.f. at the instant when the radius is r is :
\[\pi rB\left( \frac{dr}{dt} \right)\]
\[2\pi rB\left( \frac{dr}{dt} \right)\]
\[\pi r^{2}B\left( \frac{dr}{dt} \right)\]
\[\frac{\pi Br^{2}}{2}\left( \frac{dr}{dt} \right)\]

No solution provided for this question.

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