Two charges are placed on the x axis. One of the charges (q1 = +9.1 µC) is at x1 = +2.8 cm and the other (q2 = -22 µC) is at x2 = +8.4 cm. (a) Find the net electric field (magnitude and direction) at x = 0 cm. (Use the sign of your answer to indicate the direction along the x-axis.) N/C (b) Find the net electric field (magnitude and direction) at x = +5.8 cm. (Use the sign of your answer to indicate the direction along the x-axis.) N/C