WA -10.0 nC point charge and a +20.0 nC point charge are 15.0cm apart on the x-axis.hat is the electric potential at the point on the x-axis where the electric field is zero?

Answer 1

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if E=0, then the Force between the two point charges is zero, or balanced in opposite directions at that point. The potenial from each of the two charges must there be equal and opposite, and add to zero.