An electron is released a short distance above thesurface of the Earth. A second

Question

An electron is released a short distance above thesurface of the Earth. A second electron directly below it exerts anelectrostatic force on the first electron just great enough tocancel the gravitational force on it. How far below the firstelectron is the second? ______m An electron is released a short distance above thesurface of the Earth. A second electron directly below it exerts anelectrostatic force on the first electron just great enough tocancel the gravitational force on it. How far below the firstelectron is the second? ______m

Explanation / Answer

let r is the distance between the electrons and e is thecharge and m is the mass of the electron then           given that   coloumb force = gravitational force                                                                ke*e / r2 = mg                                               r = ( k e*e / mg )      where e = 1.6*10-19C                m = 9.1*10-31 kg                k = 8.9*109 N-m2 / C2                g = 9.8 m/s 2 plug in and calculate plug in and calculate

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