Particle 1 carrying charge q is at the origin of an xy coordinate system, particle 2 carrying charge -2 q is at (1, 0), and particle 3 carrying charge 7 q is at (0, 2). Part A What is the angle measured counterclockwise from the positive x axis of the electric force exerted on a particle 4 carrying charge q and located at (2, 0)? Use simple geometry and ratios