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Question

# The ratio of magnitude of electrostatic force and gravitational force for an electron and proton is2.4×103919.2×10296.6×10296.6×1039

A
6.6×1039
B
2.4×1039
C
19.2×1029
D
6.6×1029
Solution
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#### Here, for an electron and a protonElectrostatic force, |Fe|=14πε0e2r2Gravitational force, ∣∣Fg∣∣=Gmempr2∴|Fe|∣∣Fg∣∣=14πε0e2Gmem=9×109×(1.6×10−19)26.67×10−11×9×10−31×1.66×10−27=2.4×1039

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