1. A charge of 1.00 C is fixed at the origin. A charge of -9.00 C is fixed at (3.00 cm, 0.00 cm) on the x-axis. a. Find the location(s) of points on the x-axis where the electric field is zero. b. Find the location(s) of points on the x-axis where the electric potential is zero (for this part, assume V = 0 at infinity). C. Find the net electric field at the point (0.00 cm, 4.00 cm). d. Find the force on an electron placed at the point (0.00 cm, 4.00 cm).