Four point positive 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 negative point charge is placed at a distance z away from the frame ( 
), then
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A
On negative charge, the resultant force acts as a restoring force and proportional to displacement. When it reaches in the XY-plane, the resultant force is zero and the mass moves down along Z-axis due to inertia. Thus, oscillation is set along Z-axis.
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