Two charges are located on the x axis: q1 = +4.7 μC at x1 = +3.3 cm, and q2 = +4.7 μC at x2 = −3.3 cm. Two other charges are located on the y axis: q3 = +4.4 μC at y3 = +5.5 cm, and q4 = −7.8 μC at y4 = +6.4 cm. Find (a) the magnitude and (b) the direction of the net electric field at the origin. (a) Number Units (b) The net electric field points