question_answer

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 [JEE Main Online Paper Held On 12-Jan-2019 Morning]

A)                       

B)

C)                       

D)