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  4. Two coils of self inductances 9 mH and 4 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is :-

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Q. Two coils of self inductances $9 \,mH$ and $4\, mH$ are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is :-

Electromagnetic Induction

Solution:

$M = K \sqrt{ L _{1} L _{2}}$
$ \Rightarrow M =\sqrt{9 \times 4}=6 \,mH$
$\{ K =1$ for complete linkage $\}$