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**1. Homework Statement**

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. Homework 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!