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Four point +ve charges of same magnitude (Q) are placed at four corners of a rigid square frame as shown in fig.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 then :

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 one

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