Coulomb's Law

Calculate the electric force acting between two point charges using Coulomb's Law. The electric force is determined by the charges and the distance between them.

Coulomb's Law

Coulomb's law calculates the electric force acting between two electric charges q1 and q2:

F = k q1 q2 / r²

Where:

F = force of attraction or repulsion (N)
k = Coulomb's constant = 8.9875517873681764 × 10⁹ (Nm²/C²)
q1, q2 = charges (Coulombs, C)
r = distance between charges (m)

Calculator

Inputs

Charge 1 (q1) (C)

Charge 2 (q2) (C)

Distance between charges (r) (m)

Results

Electric Force-- N

Charge 1 (C)	Charge 2 (C)	Distance (m)	Force (N)
0.000001	0.000001	0.01	8.987551787368176
0.000002	0.000002	0.02	89.87551787368176
0.000001	0.000002	0.05	7.190041429894541
0.000003	0.000003	0.03	89.87551787368176
0.000001	0.000001	0.1	0.8987551787368177