The x axis is the symmetry axis of a stationary uniformly charged ring of radius R and

Question:

The x axis is the symmetry axis of a stationary uniformly charged ring of radius R and charge Q (Fig. P25.67) a point charge Q of mass M is located initially at the center of the ring. When it is displaced slightly, the point charge accelerates along the x axis to infinity. Show that the ultimate speed of the point charge is

The x axis is the symmetry axis