A charge of -5.5 micro-Coulombs is placed at the origin of a coordinate system. Another charge of -5.5 micro-Coulombs is placed at x = +0.22 m, y = +0.15 m. A third charge of +6.9 micro-Coulombs is placed at x = -0.22 m, y = 0 m. What is the magnitude of the total electric field on the charge at the the point x = 0 m, y = +0.15 m in units of 1 x 106 N/C?