Two charges, -19 X 10^-6 C and +5.4 X 10^-6C, are fixed in place and separated by 3.1 m. (a) At what spot along a line through the charges is the net electric field zero? Give the distance of the spot to the positive charge in meters (m). (Hint: The spot does not necessarily lie between the two charges.) (b) What would be the force on a charge of +14 X 10^-6 C placed at this spot?