Assignment:
Two charges, -18 and +4.0 microcoulombs, are fixed in place and separated by 3.0 meters. At what spot along a line through the charges is the net electric field zero? Locate this spot relative to the positive charge. Let the positive charge be at x=0 and the negative charge be at x=3.0 meters. Make sure the answer is in meters.
Provide complete and step by step solution for the question and show calculations and use formulas.