2.4 Suppose Q1(0.0,-3.0 m, 0.0) =4.0 nC, Q2 (0.0, 3.0 m, 0.0)= 4.0nC, and Q3 (4.0 m,0.0, 0.0) =1.0 nC. a) Find the total force acting on the charge Q3. b) repeat the problem after changing the charge of Q2 to -4.0 nC. c) Find the electric field intensity for parts a) and b)