Two identical charged spheres suspended from a common point by two mass less strings of lengths λ , are initially at a distance d(d << λ ) 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 v. Then v varies as a function of the distance x between the spheres, as:
Text Solution
Verified by ExpertsThe correct answer is:
D
Differentiating wrt time, we get
where, 
is constant
On substituting q, we get
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