Calculate the electrostatic force between two point charges.
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Calculation Results
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About this calculator
Quick Reference
FElectrostatic Force
kCoulomb Constant (8.99 × 10⁹ N·m²/C²)
q₁, q₂Electric Charges
rDistance between charges
Overview
Coulomb's law states that the electrical force between two charged objects is directly proportional to the product of the quantity of charge on the objects and inversely proportional to the square of the separation distance between the two objects.
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Pro Tips
Enter charges in Coulombs (e.g., 1e-6 for 1 microCoulomb).
Distance must be in meters.
A positive force indicates repulsion (same charges), while a negative force indicates attraction (opposite charges).
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Fun Facts
"Coulomb's law is mathematically similar to Newton's Law of Universal Gravitation."
"Electrostatic force is much stronger than gravity; for two protons, it's about 10³⁶ times stronger!"
"Charles-Augustin de Coulomb published the law in 1785."
