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As shown in figure there is a ring havin...

As shown in figure there is a ring having radius R and charge q distributed uniformly over it. If ring is rotated with a constant angular velocity @, then torque acting on the ring due to magnetic force is (Assume that magnetic field B is parallel to plane of ring)

A

`[(q omega R^2 B) /2]`

B

`(q omega B R^2 )`

C

`[(q omega B R^2 ) /2 pi]`

D

Zero

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