Question

The Hydrogen Atom: The electron with charge -1.6 X 10 ^-19 C and proton with charge 1.6 X 10 ^-19 C of a hydrogen atom are separated by a distance of approximately 5.3 x 10 ^-11 m. Find the magnitude of the electric force between the two particles. 

Answer 1

$$F=k\frac{q_1q_2}{r^2}$$

$$F=9*10^9*\frac{1.6*10^{-19}*1.6*10^{-19}}{(5.3*10^{-11})^2}=8.2*10^{-8}\:\rm N$$