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

`L_(1)+L_(2)`

`(1)/(2)(L_(1)+L_(2))`

`(L_(1)+-L_(2))`

`sqrt(L_(1)L_(2))`

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