The point charges A, B, C and D each have the same magnitude charge of 6.5 ml. Two of the charges are positive as shown and two are negative. The corners ofthe square are 10.0 cm apart. A B 10.0 cm C D {a} Find the net electric force on Charge A. State your the final direction relative to the sides of the square. [7' marks] [bl Find the total electric potential at the centre of the square produced by the system of charges. Show your work. [2 marks}