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Three point charges +4.0 μC, -5.0 μC, and -9.0 μC are placed on the x-axis at...

Three point charges +4.0 μC, -5.0 μC, and -9.0 μC are placed on the x-axis at the points x = 0 cm, x = 40 cm, and x = 120 cm, respectively. What is the electric potential at x = 80 cm?

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