Coulomb's Law Calculator
The electrostatic force between two point charges. Charges are in microcoulombs (µC).
Result
Force (N)
0.8987
How it works
F = k · q₁ · q₂ / r² (k = 8.99 × 10⁹)
Like charges repel and opposite charges attract. The force grows with each charge and falls off with the square of the distance between them.
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Frequently asked questions
What is k in Coulomb’s law?
The Coulomb constant, about 8.99 × 10⁹ N·m²/C², linking charge and distance to force.
Why divide by distance squared?
The force spreads over a sphere; doubling the distance quarters the force (inverse-square law).
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