(a) A -3.0 nC charge is on the x-axis at x = -9 cm 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? (b) A -2.0 nC charge and a +2.0 nC charge are located on the x-axis at x = -1.0 cm and x = +1.0 cm, respectively. a. At what position or positions on the x-axis is the electric field zero? b. At what position or positions on the x-axis is the electric potential zero? c. Draw graphs of the electric field strength and the electric potential along the x-axis.
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