Coulomb's law describes the magnitude of the electrostatic force between two electric charges.
The Coulomb's law formula is:
F = K_{e} * q1 * q2 / r^{2}
Where:
q1: Charge of object 1
q2: Charge of object 2
r: Distance between the two objects
F: Force between the two objects. A positive force implies a repulsive interaction, while a negative force implies an attractive interaction
K_{e} = Coulomb Constant, 8.9875517873681764 * 10^{9} N.m^{2}.C^{-2}
Coulomb's Law Examples:
What is the magnitude of the force between two protons which are 1.6E10^{-6} meters apart?
The charge of 1 proton is +1e (+1.602E-19 C).
F = 8.9875517873681764 * 10^{9} * 1.602E-19 * 1.602E-19 / (1.6E-6 * 1.6 E-6) = 9 * 10^{-17} N