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**1. Homework Statement**

Find the potential at points a and b in the diagram for charges Q1 = +1.60 nC and Q2 = -1.60 nC.

I know b is 0

**2. Homework Equations**

V = kQ/r

**3. The Attempt at a Solution**

I tried this using the equation and got

8.99e9 * [( +1.60e-6 / .05) + ( -1.60e-6 / .15 ) ] = 191700 V but this isn't right any suggestions??