Two coils of self inductance ${L_1}$ and ${L_2}$ are placed closer to each other so that total flux in one coil is completely linked with other. If $M$ is mutual inductance between them, then $M$ is
Two coils of self inductance ${L_1}$ and ${L_2}$ are placed closer to each other so that total flux in one coil is completely linked with other. If $M$ is mutual inductance between them, then $M$ is
- A
$M = {L_1}{L_2}$
- B
$M = {L_1}/{L_2}$
- C
$M = \sqrt {{L_1}{L_2}} $
- D
$M = {({L_1}{L_2})^2}$
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