Two identical charged spheres suspended from a common point by two massless strings

Two identical charged spheres suspended from a common point by two massless strings of lengths l, are initially at a distance d (d<<I) a part because of their mutual repulsion. The charges begin to leak from both the spheres at a constant rate. As a result, the spheres approach each other with a velocity The v varies as a function of the distance x between the spheres, as:
(a) v α x -1
(b) v α x1/2
(c) v α x
(d) v α x-1/2

Anurag Mishra Professor Asked on 2nd May 2016 in Physics.
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    Answer: (d) v alpha x^(-1/2) 

    Anurag Mishra Professor Answered on 6th May 2016.
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