1. The square shown in Figure I has a side length of 1.00 m and charges q1 = q2 = 1.00 nC and q3 = q4 = -1.00 nC at its corners. (a) Calculate the electric field vector at the center of the square. (b) Suppose an electron were placed at the center of the square and then released from rest. Calculate the electron's acceleration vector at the moment it is released (you may ignore the gravitational force acting on the electron). (c) Sketch some electric field lines for each charge. Don't forget to follow the rules for electric field lines. 91 92 + 93 94