A -10.0nC point charge and a +20.0nC point charge are 15.0cm apart on the x-axis.What is the electric potential at the point on the x-axis where the electric field is zero? What is the magnitude of the electric field at the point on the x-axis, between the charges, where the electric potential is zero? What is the direction of the electric field at the point on the x-axis, between the charges, where the electric potential is zero?