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## Homework Statement

Three point charges have equal magnitudes, two being positive and one negative.

These charges are fixed to the corners of an equilateral triangle.

The magnitude of each of the charges is 2.9 µC.

The lengths of the sides of the triangle are .02m

Calculate the magnitude of the net force that each charge experiences.

## Homework Equations

The only equation my professor gave me was:

F = kQq / r

^{2}

## The Attempt at a Solution

I used F = kQq / r

^{2}to get F. I got 189 N, which I think should be the magnitudes of net force at points B and C. But I don't know what to do now to get point A. I tried using other formulas I found on the web, but they keep giving me the wrong answer. Help please?