Curved surface of a very long hollow cylinder of radius (much smaller than its length) is uniformly charged with surface charge density . At the centre of this cylinder, a small insulating ring of radius ,mass and charge is coaxially placed.
The arrangement is in a gravity free space. If the cylinder is given an angular velocity about its axis, how much maximum angular velocity will the ring acquire and in which direction relative to angular velocity of the cylinder?
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The problem is taken from my Physics Book.
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