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Two concentric co - planar circular loop...

Two concentric co - planar circular loops of radius R and `r (lt lt R)` are placed as shown in the figure. The mutual inductance of the system will be

A

`(pi mu_(0)r^(2))/(2R)`

B

`(pi mu_(0)r^(2))/(4R)`

C

`(pi mu_(0)R^(2))/(4r)`

D

`(pi mu_(0)R^(2))/(2r)`

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The correct Answer is:
A
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