OJEE Mutual Inductance — practice questions

Explore 2 free Mutual Inductance questions in OJEE Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Mutual Inductance questions and exercises with answers

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Mutual inductance $M$ between two coils satisfies:Read the answer and worked solution →If the current in a primary coil changes at 30 A/s and induces 0.6 V in a secondary coil, the mutual inductance is:Read the answer and worked solution →

Worked practice questions

Mutual inductance $M$ between two coils satisfies:

$M_{12} \ne M_{21}$ always
$M_{12} = M_{21}$ by symmetry
$M_{12} = M_{21}^2$
$M_{12} = -M_{21}$

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Correct answer: B. $M_{12} = M_{21}$ by symmetry

By the symmetry of the mutual-inductance integral (Neumann formula), $M_{12} = M_{21} \equiv M$. **So you can compute it whichever way is easier — flux in coil 2 per unit current in coil 1, or vice versa.**

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If the current in a primary coil changes at 30 A/s and induces 0.6 V in a secondary coil, the mutual inductance is:

0.02 H
0.05 H
2.0 H
0.2 H

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Correct answer: A. 0.02 H

We have $|e_2| = M \cdot |dI_1/dt|$ ⇒ $M = 0.6/30 = 0.02$. So H = 20 mH.