Two coils of self-inductance L(1) and L(...

Two coils of self-inductance `L_(1)` and `L_(2)` are placed closed to each other so that total flux in one coil is completely linked with other. If `M` is mutual inductance between them, then

`M=L_(1)L_(2)`

`M=L_(1)//L_(2)`

`M=L_(2)//L_(1)`

`M =sqrt(L_(1)L_(2))`

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