Four point positive charges of same magnitude $(Q)$ are placed at four corners of a rigid square frame of side $L$ as shown in the figure. The plane of the frame is perpendicular to the $Z$-axis. If a negative point charge $(-q)$ is placed at a small distance $z$ away from the center of the frame along the $Z$-axis $(z < < L)$, then:
- AThe negative charge oscillates along the $Z$-axis.
- BIt moves away from the frame.
- CIt moves slowly towards the frame and stays in the plane of the frame.
- DIt passes through the frame only once.
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