A neutral conducting ball of radius R is connected to one plate of a capacitor (Capacitance = C), the other plate of which is grounded. The capacitor is at a large distance from the ball. Two point charges, q each, begin to approach the ball from infinite distance. The two point charges move in mutually perpendicular directions. Calculate the charge on the capacitor when the two point charges are at distance x and y form the centre of the sphere.

Answer

`Q=(qRC)/((4piin_(0)R+C))((1)/(x)+(1)/(y))`