Hi, 1. The problem statement, all variables and given/known data Two point charges 2.0 cm apart have an electric potential energy -149.9 µJ. The total charge is 28 nC. What are the two charges? 2. Relevant equations U = (kqQ) / r 3. The attempt at a solution U = -149.9 x 10^-6 = [(9 x 10^9)(28 x 10^-9 - q)(q)] / (0.02). Is that correct? I seem to get the wrong answer. Thanks!