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The mutual inductance (M) of the two coils is $3 \mathrm{H}$. The self inductances of the coils are $4 \mathrm{H}$ and $9 \mathrm{H}$ respectively. The coefficient of coupling between the coils is
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0.5
Coefficient of coupling,
$\mathrm{K}=\frac{\mathrm{M}}{\sqrt{\mathrm{L}_1 \mathrm{~L}_2}}=\frac{3}{\sqrt{36}}=0.5$
$\mathrm{K}=\frac{\mathrm{M}}{\sqrt{\mathrm{L}_1 \mathrm{~L}_2}}=\frac{3}{\sqrt{36}}=0.5$
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