Physics Laws & Theorems
Intermediate

Coulomb's Law

Electrostatic force between two point charges.

Formula

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

Variables

k8.99×10⁹
qCharges
rDistance

Example

Like charges repel and opposite charges attract, with force dropping as 1/r².

Did You Know?

Coulomb measured the incredibly tiny electric force using a delicate torsion balance he built himself.

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