PHYS 2426 Engineering Physics II Problem 21.3 1. Four identical charges qo = q1 = 92 = 93 = q are placed on the corners of a square of side a as shown in the diagram. (a) Draw a diagram showing the forces exerted on go by the other three charges. (b) Calculate the net force exerted on go and give it in unit vector notation. Give your answer in terms of k, q and a. Use the coordinate system given. (c) Calculate the magnitude and give the direction of the net force on go. Now on your diagram show the direction of the net force.