A ring of radius R has uniformly distributed charge q. A point charge Q is placed at the centre of the ring. (a) Find the increase in tension in the ring after the point charge is placed at its centre. (b) Find the increase in force between the two semicircular parts of the ring after the point charge is placed at the centre. (c) Using the result found in part (b) find the force that the point charge exerts on one half of the ring.

Answer

(a). `DeltaT=(KQq)/(2piR^(2))`
(b). `(KQq)/(piR^(2))`
(c). `(KQq)/(piR^(2))`