An electron mass of 9110 times 10-31kg and charge of -1602, Ask an Expert

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An electron (mass of 9.110 × 10^-31kg and charge of -1.602 × 10^-19C) is released at rest above the surface of the earth (where g = 9.81 m/s²). A second electron directly below it exerts an electrostatic force on the first electron that exactly cancels the gravitational force. What is the distance between the two?

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