Statement. The force of interaction between two stationary point charges q1 and q2 is directly proportional to the product of the charges and inversely proportional to the square of the distance r between them.
F α q1q2/r2
If the charges are placed in vacuum, then
F = 1/4Пεo q1q2/r2
where 1/4Пεo is a proportionality constant.
εo is the permittivity of free space = 8.85418 x 10-12 C2 /Nm2 or Farad/m
Definition of coulomb: Continue reading “Coulomb’s law and its limitations”