Three identical balls are held at a distance r from each other, Ball A to Ball B distance is r, and Ball B to Ball C distance is r. Ball A has a net charge of -2q, and Ball B has a net charge of +4q, and Ball C has a net charge of +2q.  What is the ratio of the magnitude of force of Ball A and Ball B, to Ball B and Ball C?  or (Force1/Force2)  This will be a scaler unitless fraction.    So I am doing this problem and this is what I got so far    I need help to see what I may be doing wrong.

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