Four point +ve charges of same magnitude $(Q)$ are placed at four corners of a rigid square frame as shown in figure. The plane of the frame is perpendicular to $Z$ -axis. If a -ve
point charge is placed at a distance $z$ away from the above frame $(z <<)$ then

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The negative charge oscillates, the resultant force acts as a restoring force and is $cos θ component,$ proportional to displacement. When it reaches the plane $X Y$ , the resultant force is zero and the mass moves down due to inertia. Thus oscillation is set. [This problem is similar to

Physics - Electrostatics Question with Solution | TestHub

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