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

`irvecB`

`2pir ivecB`

Zero

`pi ri vecB`

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