The gravitational force between a $H$-atom and another particle of mass $m$ is given by Newton's law $F = G\frac{M m}{r^2}$. Here,$M$ represents:
- A$M = m_{proton} + m_{electron}$
- B$M = m_{proton} + m_{electron} - \frac{B}{c^2}$ (where $B = 13.6 \, eV$)
- C$M$ is not related to the mass of the hydrogen atom
- D$M = m_{proton} + m_{electron} - \frac{|V|}{c^2}$ (where $|V|$ is the magnitude of potential energy)
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