Two identical charged spheres suspended from a common point by two massless strings of lengths l , are initially at a distance d (d << l) apart 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 v. Then v varies as a function of the distance x between the spheres, as :

1. A. v x 1/2
2. B. v x
3. C. v x -1/2
4. D. v x -1

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