A point charge of 4 C is located at x = 2 m, y = 3 m. A second point charge of -4 C is located at x = 2 m, y = -1 m.
(a) Find the magnitude and direction of the electric field at x = -3 m, y = 1 m.
(b) Calculate the magnitude and direction of the force on an electron at x = -3 m, y = 1.