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A current carrying loop of radius r carr...

A current carrying loop of radius `r` carries a current `I`. It is placed in a magnetic field `B_0` such that the plane of the coil is perpendicular to the magnetic field. The net force on the coil is

A

`2 pi r I B_0`

B

`pi r^2 I B_0`

C

`2 pi r^2 I B_0`

D

zero.

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