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Q.

The ratio of electrostatic force to gravitational force between a proton and an electron separated by certain distance in vacuum is

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a

1.6×1038

b

4.1×1040

c

1.3×1036

d

2.4×1039

answer is B.

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Detailed Solution

Fe=14πε0e2r2

Fg=Gmempr2

∴ FeFg=14πε0e2Gmemp

=9×109×1.6×10-1926.67×10-11×9×10-31×1.66×10-27

=2.4×1039

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