Four electric charges `+q, +q, -q` and `-q` are placed at the corners of a square of side 2
Channel: Doubtnut
Date: 2020-01-19

Four electric charges `+q, +q, -q` and `-q` are placed at the corners of a square of side 2L (see figure). The electric potential at point `A`, mid-way between the two charges `+q` and `+q`, is