Posted by Steve on Wednesday, April 8, 2009 at 6:46pm.
Add the forces due to q1 and q3. All charges are located along the x axis.
q1 pushes q2 to the left, and q3 pushes q2 to the right. Therefore you will have to subtract one force from the other to get the difference. Both are forces of repulsion, since all charges are the same.
To compute the force of one particle on another, use Coulomb's law.
F = k q q'/R^2
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