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Lenz's Law

The sum and t...

Question

The sum and the difference of self-inductance of two coils are 13 H and 5 H respectively. The maximum mutual inductances of the two coils is,

A

13 H

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B

5 H

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C

28 H

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D

6 H

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Solution

The correct option is D 6 H
$L_{1} + L_{2} = 13 L_{1} - L_{2} = 5 L_{2} = 4 H ∴ M = K \sqrt{L_{1} L_{2}} M_{m a x} = 1 \sqrt{9 \times 4} = 6 H$

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