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Two different coils of self inductance L...

Two different coils of self inductance L 1 ​ and L 2 ​ are placed close to each other so that the effective flux in one coil is completely linked with other. If M is the mutual inductance between them, then

A

`L_1+L_2`

B

`L_1+L_2-2M`

C

`L_1+L_2+M`

D

`L_1+L_2+2M`

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The correct Answer is:
D
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