An electron is a subatomic particle (m = 9.11 x10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.11 x 105 m/s to a final velocity of 1.67 x 106 m/s while traveling a distance of 0.0654 m. The electron's acceleration is due to two electric forces parallel to the x axis: = 8.18 x 10-17 N, and , which points in the -x direction. Find the magnitudes of (a) the net force acting on the electron and (b) the electric force .

A +10 µC charge is placed at the origin. A -20 µC charge is located at x = 1 m and a +40 µC charge is located at y = -2 m. What is the electric force acting on the +10 µC charge