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 q = 7.50 C, q2 8.50 C, and 93 = -5.50 c.) 91 92 = magnitude direction a + 0.500 m 60.0 x + 9, N/C below the +x-axis