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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<

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a

– ve charge oscillates along the Z - axis.

b

It moves away from the frame

c

It moves slowly towards the frame and stays in the plane of the frame

d

It passes through the frame only once.

answer is A.

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Detailed Solution

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