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An infinitely long current carrying wire...

An infinitely long current carrying wire and a small current carrying loop are in the plane of the paper as shown. The radius of the loop is a and distance of its centre from the wire is d (`dgtgta`). If the loop applies a force F on the wire then :

A

F=0

B

`F=prop((a)/(d))`

C

`F=prop((a^(2))/(d^(3)))`

D

`Fprop((a)/(d))^(2)`

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