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**1. The problem statement, all variables and given/known data**

A positive charge, q1 is at (-20cm,0). An equal and opposite charge q2 is at (20cm, 0). A positive charge q3, equal to q1, is placed at (60cm,0). What is the potential energy of the three charges??

**2. Relevant equations**

EPE= kq / r

**3. The attempt at a solution**

EPE = k( (5 X 10^-9)/.2) + (5 X 10^-6)/.6) - (5 X 10^-6)/.2))

= wrong answer

**1. The problem statement, all variables and given/known data**

**2. Relevant equations**

**3. The attempt at a solution**