Free Coulomb's Law Calculator
Calculate the electrostatic force between two point charges using Coulomb's law: F = k * |q1 * q2| / r².
C
C
m
Electrostatic Force
7.1900 N
Electrostatic Force vs Charge 1
Coulomb's Law
Coulomb's law gives the magnitude of the electrostatic force between two point charges.
Formula
F = k * q1 * q2
where k = 8.9875 x 10^9 N·m²/C². Like charges repel, unlike charges attract.
Example Calculation
Two charges (1 μC and 2 μC) separated by 5 cm.
- 01F = k * |q1 * q2| / r²
- 02F = 8.9875e9 * |1e-6 * 2e-6| / 0.05²
- 03F = 8.9875e9 * 2e-12 / 0.0025
- 04F = 0.01798 / 0.0025 = 7.19 N
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