A plastic circular loop has radius R, and a positive charge

A plastic circular loop has radius R, and a positive charge q distributed uniformly around the circumference of the loop. The loop is then rotated around its central axis, perpendicular to the plane of the loop, with angular speed (?). If the loop is an a region where there is a uniform magnetic field directed parallel to the plane of the loop, find magnitude of teh magnetic torque on the loop.

 

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