Three charges of magnitude 3.0 x 10^-4 C each are located at x = 1.0 m, y = 0.0 m, at x = 0.0 m, y = 0.0 m, and at x = -1.0 m, y = 0.0 m. The one in the middle is positive, while the other two are negative. What is the net Coulombic force exerted by them on a negative 3.0 x 10^-5 C charge located at x = 0.0 m, y = 2.0 m? (The value of k is 9.0 x 10^9 N*m^2/C^2.) Please draw a sketch representing the situation of the problem while showing the relevant variables, such as forces, and provide a step-by-step solution.