Two coils of self inductance L1 and L2 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 

(1) M = L1 L2

(2) M = L1/L2

(3) M=L1L2

(4) M = (L1 L2)2

Concept Videos :-

#14 | Mutual Induction
#15 | Reciprocity Theorm & Mutual Induction

Concept Questions :-

Mutual-inductance

(3) M=e2di1/dt=e1di2/dt

Also e1=L1di1dt.e2=L2di2dt

M2=e1e2di1dtdi2dt=L1L2M=L1L2  

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