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For perfect coupling of two coils of ind...

For perfect coupling of two coils of inductance `L_1` and `L_2`, their mutual inductance `M` should be given by :

A

`M=L_1L_2`

B

`M=L_1/L_2`

C

`M=sqrt(L_1L_2)`

D

`M=[L_1/L_2]^(1//2)`.

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