9 of 15 13. Three negative point charges are located on an equilateral triangle as shown in the diagram. The charges are: q1 = 4.8 x 10'19C q2 = 3.2 x 10196 q3 = 1.6 x 10196 a) Draw a freebody diagram showing the electric forces acting on ' charge ql. Do not include the force of gravity. [A 1 mark] b) Determine the magnitude and direction of the net electric force 1 cm acting on charge ql. [A 6 marks]