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A conducting circular loop of radiius r ...

A conducting circular loop of radiius `r` carries a constant current `i`. It is placed in a uniform magnetic field `vec(B)_(0)` such that `vec(B)_(0)` is perpendicular to the plane of the loop . The magnetic force acting on the loop is

A

`irB_(o)`

B

`2piriB_(o)`

C

zero

D

`piriB_(o)`

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