Physics
Advanced

Coulomb's Law

Electrostatic force between two charges.

Formula

F=kq1q2r2F = k\frac{q_1 q_2}{r^2}

Variables

q_1,q_2Charges
rDistance
k8.99×10⁹

Example

Two 1 μC charges 1 m apart repel with F = 9×10⁹·(10⁻⁶)²/1² ≈ 9 mN.

Did You Know?

The electric force is about 10³⁶ times stronger than gravity — which is why atoms hold together.

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