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## Homework Statement

A particle with charge 3 μC is located on the x-axis at the point -10 cm, and a second particle with the charge 4 μC is placed on the x-axis at -4 cm.

What is the magnitude of the total electrostatic force on the third particle with the charge 7 μC placed on the x-axis at -2 cm? The Coulomb constant is 8.9875e9.

## Homework Equations

[tex]F=(k*Q_1*Q_2)/(r^2)[/tex]

## The Attempt at a Solution

I realize how simple this problem is but the stupid online software keeps telling me I'm wrong (which I very well might be). I converted μC to C and cm to m. I keep getting 652, so with sig figs, 700 N.

What am I doing wrong? Thanks!

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