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 lt lt L)` then A. `-ve` charge oscillates along the z axis.B. It moves away from the frameC. It moves slowly towards the frame and stays in the plane of the frameD. It passes through the frame only once.

Four point `+ve` charges of same magnitude`(Q)` are placed at four cor

1.	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 lt lt L)` then A. `-ve` charge oscillates along the z axis.B. It moves away from the frameC. It moves slowly towards the frame and stays in the plane of the frameD. It passes through the frame only once.
Answer» Correct Answer - a The negative charge osscillates, 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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