Two identical charged spheres suspended from a common point by two mass less strings of length l are initially a distance d,(d<<l) apart because of their mutual repulsion. The charge begins to leak from both the spheres at a constant rate. As a result, charges approach each other with a velocity v. Then, as a function of distance x between them, is
(a) v ∝ x-1
(b) v ∝ x1/2
(c) v ∝ x
(d) v ∝ x-1/2
