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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 $(z \ll L)$ thenPhysics Question Image

Electric Charges and Fields

Solution:

Correct answer is (a) - ve charge oscillates along the $Z$ axis.