1. The problem statement, all variables and given/known data What is the magnitude of the electric field at the two points on the x-axis where the electric potential is zero? 2. Relevant equations E= kQ/r^2 3. The attempt at a solution I tried setting three cases, between the charges, to the right of the positive charge, and to the left of the negative charge. Assuming the negative charge is placed on x-axis at x=0.