Question

# Two coils of self-inductances $$2\ mH$$ and $$8\ mH$$ are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is:

A
10 mH
B
6 mH
C
4 mH
D
16 mH

Solution

## The correct option is C $$4\ mH$$Mutual inductance M=$$\sqrt{ L_1\times L_2}=\sqrt{ 2\times 8}=4$$mHPhysicsNCERTStandard XII

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