Two positive charges of 17e-10 c are placed on the x axis, Ask an Expert

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Two positive charges of 1.7e-10 C are placed on the x axis at distances +20 cm and -20 cm from the origin, respectively. A third positive charge of 1.5e-11 C can be moved along the y axis. At what value of y the electrostatic force on the third charge is maximal?

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