An electron is held up against the force of gravity by theattraction of a fixed

Question

An electron is held up against the force of gravity by theattraction of a fixed proton some distance above it. How farabove the electron is the proton? A) 1.5 m B) 5.1 m C) 4.6 m D) 2.3 m E) 3.7 m How do you solve this.....do you set gravitational force equalto electrical force?? If so, where do you go from there? An electron is held up against the force of gravity by theattraction of a fixed proton some distance above it. How farabove the electron is the proton? A) 1.5 m B) 5.1 m C) 4.6 m D) 2.3 m E) 3.7 m How do you solve this.....do you set gravitational force equalto electrical force?? If so, where do you go from there?

Explanation / Answer

Down ward force = m g where m = mass of the electron = 9.1 * 10 -31kg Upward force F ' = K q 2 / r2                             =( 8.99 * 10 9 ) ( 1.6 * 10 -19 ) 2/ r 2 Acccording to problem , F = F '     ( 9.1 * 10 -31 kg )9.8   = ( 8.99 * 10 9 ) ( 1.6 * 10-19 ) 2 / r 2                                  r 2 = 25.8                                     r = 5.08 m                                  r 2 = 25.8                                     r = 5.08 m

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