Two charges, -18 C and +4.9 C, are fixed in place and separated by 4.2 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 C placed at this spot?
(a) Number ___Units m
(b) Number ___ Units N