1. The problem statement, all variables and given/known data A -14.3 nC point charge and a +24.9 nC point charge are 17.4 cm apart on the x-axis. 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 V = kq/r E = kq/r^2 3. The attempt at a solution Since the potential = 0, q1 = -14.3 nC, q2 = 24.9 nC kq1/(r+0.174) = kq2/r But this gives me one negative value for r, whereas I need two values.