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A +7.0-μC point charge is placed at the 0.0 cm mark of an x-axis and a...

A +7.0-μC point charge is placed at the 0.0 cm mark of an x-axis and a -5.0-μC charge is placed at the 70 cm mark. What is the net electric field strength at the 40 cm mark on the x-axis?

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