Two point charges q 4.0 nC and q 6.0 nC are located on the x axis at x 3.0 cm and x 3.0 cm respectively a Find a position or positions on the x axis other than infinity where the electric potential is zero 2 b How much work is needed to bring a third charge q 2.0 nC from infinity to the point x 0 in the above set up 2 c When you have the third charge q 2.0 nC at the point x 0 and the other charges where they are what is the electric potential energy of the whole system of the three charges 3