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

Three point charges, which initially are infinitely far apart, are placed at the corners of an equilateral triangle with sides "b". Two of the point charges are identical and have charge "q".

If zero net work is required to place the three charges at the corners of the triangle, what must the value of the third charge be?

**2. Relevant equations**

**3. The attempt at a solution**

I know the electric potential at infinity is zero, but I'm not sure how to start this

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

**2. Relevant equations**

**3. The attempt at a solution**