There is a uniform spherically symmetric surface charge density at a distance \( R_{0} \) from t...

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There is a uniform spherically symmetric surface charge density at a distance \( R_{0} \) 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
(a)
(b)
(c)
(d)
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