F = k {( |q1|*|q2| ) / R2 }
Where F is the electrostatic force of attraction or repulsion between two charged particles (point charges).
q1 and q2 represent the point charges, which may be negative or positive.
R is the separation between the two points.
k is a constant, where
k = 8.99x109 (N*m2)/C2 (Newtons)(meters squared) over (Coulombs squared)
Note the
similarities Coulomb's Law and
Newton's Law of Gravitation