In the Rutherford model of the hydrogen atom, a proton (mass M, charge Q) is the nucleus and an electron (mass m, charge q) moves around the proton in a circle of radius r. Let k denote the Coulomb force constant (1/4??0) and G the universal gravitational constant. The ratio of the electrostatic force to the gravitational force between electron and proton is:
A) kQq/GMmr2
B) GQq/kMm
C) kMm/GQq
D) GMm/kQq
E) kQq/GMm
E) kQq/GMm
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