Three charges are at the corners of an equilateral triangle, as shown in the figure below. Calculate the electric field at a point midway between the two charges on the x-axis. (Let q1 = 7.00 MC, q2 = 4.50 MC, and 93 = -5.50 MC.) 9, + 0.500 m 60.00 + magnitude 1450000 N/C 0 X direction .o below the +x-axis