A Hydrogen Atom Consists of an Electron Orbiting a Nucleus

Multiple Choice

A hydrogen atom consists of an electron orbiting a nucleus made of a single proton. The electrostatic force between the two is 2.3 * 10³⁹ times greater than the gravitational force. If we could adjust the separation between the two particles, the distance at which the electrostatic and gravitational forces would be equal is

A) 2.3* 10³⁹ m.
B) 0.47 * 10²⁰ m.
C) 0.21 * 10^-20 m.
D) 0.43 * 10^-39 m.
E) none of the above; the electrostatic and the gravitational forces acting between the two can never be equal.