Asked by Petra Tanovic

A small bead of mass m and charge q is free to move in a horizontal tube. The tube is placed in between two spheres with charges Q = − q. The spheres are separated by a distance 2a. What is the frequency of small oscillations around the equilibrium point of the bead? You can neglect any friction in the tube.
(Hint: When the bead is only slightly displaced, the force acting on it changes negligibly.)

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