A$)$ What is the magnitude of the electric force between a proton and an electron when they are at a distance of $3\mathrm{.}39$ angstrom from each other?

B$)$ What is the magnitude of the electric force between two protons inside a nucleus when they are at a distance of $3\mathrm{.}39$ fermi from each other?

C$)$ What is the magnitude of the electric force between an $\text{'}$up$\text{'}$ and a 'down' quark inside a proton when they are at a distance of $0\mathrm{.}767$ fermi from each other? $($The up quark has an electric charge of $(+2/3)$e$,$ the down quark has an electric charge of $(-1/3)$e$,$ where e is the elementary charge.$)$