3. Prob.2.(25 points) Three charges (Q1 = Q3 = -20.OnC, and Q2 = 10.OnC) are arranged on the three vertices of a triangle. [a] (10 points) Determine the electric potential energy of the 3-charge configuration. PQ Q2 4.0cm Q1 Q3 3.0cm of 3.0cm X [b] (8 points) How much work would you have to do to displace Q2 from its present position to infinity? [c] (7 points) What is the electric potential at point P(x = 0.0, y = 4.0 cm) due to the two remaining charges Q, and Q3