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## Homework Statement

A -3.0 nC charge is on the x-axis at x = -9cm and a +4.0 nC charge is on the x-axis at x = 16 cm. At what point or points on the y-axis is the electric potential zero?

## Homework Equations

V = kq/r

## The Attempt at a Solution

I know the answer is +/- 12 cm but I have no clue as to how that number was achieved. Can anybody please help me out with this one?