There is a uniform spherically symmetric surface charge density at a distance Ro from the origin. The charge distribution is initially at rest and starts expanding because of mutual repulsion. The figure that represents best the speed V(R(t)) of the distribution as a function of its instantaneous radius R(t) is :
Potential Energy Of System Of two Charge -
- wherein
At any instant
Total energy of charge distribution is constant
and slope of V-R curve is decreasing
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