PF EMI BYU 11

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Curved surface of a very long hollow cylinder of radius R (much smaller than its length) is uniformly charged with surface charge density sigma. At the centre of this cylinder, a small insulating right of radius r, mass m and charge q is coaxially placed. The arrangement is in a gravity free space. If the cylinder is given an angular velocity wo 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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