1. The problem statement, all variables and given/known data The potential energy of a system of two charges (q1 = 5.0 µC and q2 = 3.3 µC) is 0.37 J. What is the distance between the charges? 2. Relevant equations U=(kq_0q)/r --> r=U/(kq_0q) U=V/q_0 V=0.37J q1 = 5.0 µC q2 = 3.3 µC 3. The attempt at a solution So I was going to use equation 2 but I have two charges involved and that one only asks for q_0. Do I calculate the change of the charge and use that for q_0?