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Q.

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

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a

M=L1L2

b

M=L1/L2

c

M=L1L2

d

M=(L1L2)2

answer is C.

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Detailed Solution

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