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A -3.0-nC charge is at (0, 0) and a +7.0-nC charge is at (0, 3.0 m)....

A -3.0-nC charge is at (0, 0) and a +7.0-nC charge is at (0, 3.0 m). If the potential is taken to be zero at infinity, what is the work required to bring a 1.0-nC charge from infinity to point (4.0 m,0)?

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