Four point `+ve` charges of same magnitude`(Q)
Channel: Doubtnut
Date: 2020-01-19

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