Question

A long insulating cylinder of radius R and length b carries a uniformly distributed surface charge Q

A long insulating cylinder of radius R and length b carries a uniformly distributed surface charge Q . A string is coiled around the cylinder, from which a point mass m hangs. The mass is free to move downwards and rotate the cylinder. What is the acceleration of the mass?
(Neglecting Moment of Inertia of the cylinder.)

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