Electricity Problem Two tiny spheres of charge +q are connected by an insulating

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Electricity Problem

Two tiny spheres of charge +q are connected by an insulating rod. The length of the rod is 4a. In the middle of the rod we insert a ring of mass M and charge -q free to move. Neglect friction between the rod and the ring Initially the ring is in the middle of the rod (see figure below). Calculate and plot the potential energy of the ring as a function of x. Discuss whether the ring is in a stable or unstable position when it is in the middle of the rod. If we add two pins A and B at a distance a from the center, what is the kinetic energy Kf of M when it will hit one of the pin (see figure)?

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Electricity Problem Two tiny spheres of charge +q are connected by an insulating

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