Question

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An electron is released a short distance above Earth’s surface. Asecond electron directly below it exerts an electrostatic force onthe first electron just great enough to cancel the gravitationalforce on it. How far below the first electron is the sec-
ond? The value of Coulomb’s constant is 8.98755 × 109 N · m2/C2 andthe acceleration of gravity is 9.81 m/s2 .

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