💡ap physics c: e&m review

Vacuum permittivity (ε0)

Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examWritten by the Fiveable Content Team • Last updated September 2025

Definition

Vacuum permittivity, denoted as ε0, is a fundamental constant in physics that represents the ability of free space to permit the formation of an electric field. It quantifies how easily electric fields can be established and propagated through empty space.

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