Two point charges q1 = 2.0 C and q2 = 1.0 C are fixed in a plane at the positions given by the Cartesian coordinates shown in the figure at right. Consider that they are in a vacuum, where ko = 9.0 × 109 N.m2/C2. Calculate the magnitude of the electric field vector at point A and represent it in the figure, scale, showing its direction and meaning