Four charges of `1mu C, 2mu C, 3mu C` and `-6 mu C` are placed one at each corner of the square of side `1 m`. The square lies in the x-y plane with its centre at the origin.

Answer

A, C

Explanation

Here total charge is zero

Any point on z-axis, having the same distance from the each vertex of square. So the potential due to all is zero at the point.