Show all your work for full credit. State the formula(s) used, substitution of values, and the final answer with appropriate unit and direction if necessary. Question 17 (9 points) 4JML Three charges are placed at the corners of an equilateral triangle with sides of length 6.0 cm as shown in diagram above. [Note: 1. 0 p0 = 1.0x 10'6 C] (a) Calculate the total electric potential energy of the group of charges (3 marks) (b) Determine the net electric force on the 4. 0 #0 charge (6 marks)