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MHT CET 2023 (14 May, Shift 2) · Magnetic Flux & Faraday's Law

Magnetic Flux & Faraday's Law question from MHT CET 2023 (14 May, Shift 2)

Q41MHT CET 2023 · 14 MAY · SHIFT 2Easy

Magnetic Flux & Faraday's Law

A coil having effective area A, is held with its plane normal to magnetic field of induction B. The magnetic induction is quickly reduced by $25\%$ of its initial value in 2 second. Then the e.m.f. induced across the coil will be

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Answer: (a)

$e = \frac{A\,\Delta B}{\Delta t}$
Reduced BY $25\%$ : $\Delta B = 0.25B = \frac{B}{4}$
$e = \frac{A(B/4)}{2} = \frac{AB}{8}$
So the answer is (a) $\frac{AB}{8}$ .

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