For a Hydrogen Atom of Radius 10^-10 M How Does

For a hydrogen atom of radius 10^-10 m how does the ratio of the gravitational force between the electron and the proton to the electrostatic force F_g/F_e change if the atomic radius is doubled?

A) The ratio decreases by a factor of four.
B) The ratio decreases by a factor of two.
C) The ratio remains unchanged.
D) The ratio doubles.
E) The ratio increases by a factor of four.

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