An emf of 90 mV is induced in the winding of a coil, when current in a nearby coil is increasing at the rate of 4.5 A/s. What is the mutual inductance of the two coils?

Q.26 An emf of 90 mV is induced in the winding of a coil, when current in a nearby coil is increasing at the rate of 4.5 A/s. What is the mutual inductance of the two coils?

Doubtly Asked 28 Oct 2026 Board exam · June 2026 hsc 12th Save WhatsApp Report

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Answer: \(M=0.02\) H \(=20\) mH

Induced emf in the secondary: \(|e|=M\dfrac{dI}{dt}\).

\(M=\dfrac{|e|}{dI/dt}=\dfrac{90\times10^{-3}}{4.5}=2\times10^{-2}\) H \(=20\) mH.

Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report

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An emf of 90 mV is induced in the winding of a coil, when current in a nearby coil is increasing at the rate of 4.5 A/s. What is the mutual inductance of the two coils?

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