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  4. 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 < < L) then

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Q. 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 ($z < < L$) thenPhysics Question Image

AIIMSAIIMS 2005

Solution:

The negative charge oscillates, the resultant force acts as a restoring force and is $\cos \theta$ component, proportional to displacement. When it reaches the plane AT, the resultant force is zero and the mass moves down due to inertia. Thus oscillation is set.
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