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In Fig. there is a conducting loop ABCDE...

In Fig. there is a conducting loop `ABCDEF` of resistance `lambda` per unit length placed near a long straight current-carrying wire. The dimension are shown in the figure. The long wire lies in the plane of the loop. The current in the long wire varies as `I = I_(0)(t)`.
The mutual inductance of the pair is

A

`(mu_(0)a)/(2 pi)ln ((2a+l)/(l))`

B

`(mu_(0)a)/(2 pi)ln ((2a-l)/(l))`

C

`(2 mu_(0)a)/( pi)ln ((a+l)/(l))`

D

`(mu_(0)a)/(2 pi)ln ((a+l)/(l))`

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