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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