Two coils of self-inductance 25 mH and 9 mH are placed close together such that the effective flux in one…
Two coils of self-inductance 25 mH and 9 mH are placed close together such that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is
34 mH
16 mH
15 mH
6 mH
Solution
If $\mathrm{L}_1$ and $\mathrm{L}_2$ are the inductances of the first and second coil respectively, then mutual inductance between the two coils is given by
$\mathrm{M}=\sqrt{\mathrm{L}_1 \mathrm{~L}_2}=\sqrt{25 \times 9}=15 \mathrm{mH}$
/