The following point charges are placed on the x-axis in air: +2.0 C at x = 20

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The following point charges are placed on the x-axis in air: +2.0 μC at x = 20 cm, −3.0 μC at x = 30 cm, −4.0 μC at x = 40 cm. Find the absolute potential on the axis at x = 0.

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