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A point charge (-5.0 mC) is placed on the x axis at x = 4.0 cm,...

A point charge (-5.0 mC) is placed on the x axis at x = 4.0 cm, and a second charge (+5.0 mC) is placed on the x axis at x = -4.0 cm. What is the magnitude of the electric force on a third charge (+2.5 mC) placed on the y axis at y = 3.0 cm?
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