Electricity & Magnetism

Coulomb's Law

F = k \frac{q _{1} q _{2}}{r ^{2}}

Electric force between two point charges.

Variables

F

Electric force

Force between charges

N

k

Coulomb constant

8.99×10⁹

N·m²/C²

q₁

Charge 1

First charge

C

q₂

Charge 2

Second charge

C

r

Distance

Between charges

m

Derivation

Fundamental law. k = 1/(4πε₀).

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