A 4.8-µC point charge is located at x = 1.2 m, y = 3.2 m, and a -3.9-µC point charge is located at x = 2.3 m, y = -2.1 m.
(a) Find the magnitude and direction of the electric field at x = -3.4 m, y = 0.9 m.
(b) Find the magnitude and direction of the force on a proton at x = -3.4 m, y = 0.9 m.