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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

a
M=L1L2
b
M=L1/L2
c
M=L1L2
d
M=(L1L2)2

detailed solution

Correct option is C

M=−e2di1/dt=−e1di2/dt Also e1=−L1di1dt.e2=−L2di2dtM2=e1e2di1dtdi2dt=L1L2⇒M=L1L2

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