Scientific Ontology

\varepsilon_0

Fundamental Constants

Vacuum Permittivity

Permittivity of free space; sets the strength of electrostatic interactions.

farad per metre (F/m)

Dimension: $[\,M^{-1} L^{-3} T^4 I^2\,]$

Fixed constant from the A-level data sheets.

8.85 × 10^-12 F/m

A-level value

Coulomb's Law

F = \dfrac{1}{4\pi\varepsilon_0}\dfrac{q_1 q_2}{r^2}

Electric Field (point charge)

E = \dfrac{1}{4\pi\varepsilon_0}\dfrac{Q}{r^2}

Electric Potential (point charge)

V = \dfrac{1}{4\pi\varepsilon_0}\dfrac{Q}{r}