recall and use Coulomb’s law F = Q1Q2/(4πε0r²) for the force between two point charges in free space
use V = Q/(4πε0r) for the electric potential in the field due to a point charge
recall and use Coulomb’s law F = Q1Q2/(4πε0r²) for the force between two point charges in free space
use V = Q/(4πε0r) for the electric potential in the field due to a point charge