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map7s
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Homework Statement
A point charge q = -0.80 nC is fixed at the origin. Where must a proton be placed in order for the electric force acting on the proton to be exactly opposite to its weight? (Let the y-axis be vertical and the x-axis be horizontal.)
Homework Equations
F=(kq1 q2)/r^2
The Attempt at a Solution
I first tried drawing this out and it seems like it should be a pretty straightforward problem, but I seem to be having more trouble with it than I probably should. I know that F would have to equal zero, but if I do that then I can't solve for r.