1. The problem statement, all variables and given/known data Charges of 5 µC are located at x = 0, y = 2.0 m and at x = 0, y = -2.0 m. Charges Q are located at x = 4.0 m, y = 2.0 m and at x = 4.0 m, y = -2.0 m. The electric field at x = 0, y = 0 is (9e3 N/C) . Determine Q. 2. Relevant equations E = kQ/r^2 3. The attempt at a solution I converted my units to C so I could use the k constant of 8.99e9 N*m^2/C^2 I know that all the vertical components get cancelled out so the only force is the the x positive direction. I set up my equation like this E= kQ/r^2 with E being 9e3 and r^2 being 20 I end up with 9e3=kQ/10 and when I solve for Q I get 1e-5 C and when I convert my answer to microcoloumbs I get 10. I think I am having problems with my conversions. Any help would be greatly appreciated!!