Q .     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 other. If `M` is the mutual inductance between them, then

MHCET 2012
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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