Three identical conducting spheres are placed in a line. From left to right, Qa = 2C, Qb = 3C and Qc = -4C. You touch the spheres all together at the same time and then separate them. What is the charge on sphere A?

Answer 1

Well, I expect they would all be at the same voltage compared to ground.
They are identical so each would have the same charge, the average
(2+3-4)/3 = 1/3 C