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Statement of a problem № 2820

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

Solution:
The following point charges are placed on the x-axis: +2.0 nC at x = 20 cm, —3

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