Two different coils of self-inductance $L_{1}$ and $L_{2}$ are placed close to each other so that the effective flux in one coil is completely linked with the other. If $M$ is the mutual inductance between them,then:
- A$M=L_{1} / L_{2}$
- B$M=L_{1} L_{2}$
- C$M=\sqrt{L_{1} L_{2}}$
- D$M=\left(L_{1} L_{2}\right)^{2}$
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