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A -3.0 nC charge is on the x-axis at x = -7.0 cm and a +4.0...

A -3.0 nC charge is on the x-axis at x = -7.0 cm and a +4.0 nCcharge is on the x-axis at x = 20 cm . At what point or points on the y-axis is the electric potential zero?

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