Physics equations/18-Electric charge and field/A:ElectricFieldGravityCompare

${\displaystyle F_{G}=G{\frac {mM}{r^{2}}}\,}$ , where ${\displaystyle G\approx 6.674\times 10^{-11}\ m^{3}\ kg^{-1}\ s^{-2}}$
Calculate the ratio of gravity to electrical forces for a proton and an electron separated by distance equal to the Bohr radius, ${\displaystyle a_{0}\approx 0.526\times 10^{-10}m}$ , with the electron mass ${\displaystyle \approx 9.11\times 10^{-31}kg}$, and the proton mass ${\displaystyle \approx 1.671\times 10^{-27}kg}$. The ratio F/FG is about 2x1039, a large large number.