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Standard XII
Physics
Question

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. v∝x12
  2. v∝x
  3. v∝x−12
  4. v∝x−1

A
v∝x12
B
v∝x
C
v∝x−12
D
v∝x−1
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