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Two coils of self inductance 100 mH and 400 mH are placed very close to each other. Find the maximum mutual inductance between the two when 4 A current passes through them.

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200 mH

$100 \sqrt{2} m H$

none of these

300 mH

answer is A.

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Detailed Solution

Maximum mutual inductance:

$M = \sqrt{L_{1} L_{2}} = 200 m H$

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