Q. Four point 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 - axis. If - ve point charge is placed at a distance away from the above frame () then Physics Question Image

 3139  179 AIIMSAIIMS 2005 Report Error

Solution:

The negative charge oscillates, the resultant force acts as a restoring force and is 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.
[This problem is similar toimage