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I worked out this problem but I got a wrong answer.

First, I used the Pythagorean theorem to find the radial distance between A and each charges. So 1.2m divided by 2 (= 0.6), then the square root of .6 squared + .6 squared = .849, which is the radius.

Then I used Coulomb's Law to calculate the net force:

kqAq1/R2 + kqAq2/R2 + ... and so forth.

I took out the kqA/R2, which is the same for all, and came up with:

kqA/R2 (q1 + q2 + q3 + q4).

But it so happens that the numbers inside the parenthesis turns out to be 0.

What did I do wrong?

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# Electric Charge

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