Actually the question is that how much work is reqd. to takr a negative charge from the centre of this cube to infinity.
Then answer should be zero as the potential difference between centre and infinity pt. Is zero. But the ans is NOT ZERO
What should be the potential of a cube at infinity having 6 equal charges placed at its corners?In first attempt I made it zero as looking from infinity all tge 8 pt. charges will seem to be coincided at a single point and potential of a 8q charge at infinity would be zero..?