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MHT CET 2026 (20 May, Shift 1) · Magnetic Flux & Faraday's Law

Magnetic Flux & Faraday's Law question from MHT CET 2026 (20 May, Shift 1)

Q2MHT CET 2026 · 20 MAY · SHIFT 1Easy

Magnetic Flux & Faraday's Law

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

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Answer: (d)

Average emf $e = \frac{\Delta\Phi}{\Delta t} = \frac{A\,\Delta B}{\Delta t}$ .
Field falls to $25\%$ : $\Delta B = B - 0.25B = 0.75B = \frac{3B}{4}$
$e = \frac{A(3B/4)}{2} = \frac{3AB}{8}$
So the answer is (d) $\frac{3AB}{8}$ .

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