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Two coils of self-inductance 2mH and 8 ...

Two coils of self-inductance `2mH` 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 coil is

A

16 mH

B

10 mH

C

6 mH

D

4 mH

Text Solution

Verified by Experts

The correct Answer is:
D
Mutual inductance between coils is
`M=ksqrt(L_(1)+L_(2))`
`=1sqrt(2xx10^(-3)xx8xx10^(-3))" " ( :. K=1)`
`=4xx10^(-3)H=4mH`
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