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Homework Statement
In the figure, what is the force on charge Q3?
Q1 = 5×10-6C, Q2 = -3×10-6C, Q3 = 4×10-6C
http://www.usi.edu/science/physics/pickett/206/4p2f1.jpg
Homework Equations
Coulomb's law
The Attempt at a Solution
I thought I could just find the charges on q1 and 3 and then on 2 and 3 and add them but I don't think that is right. Can you just add electrical forces?
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