EngiRef / Electromagnetic Constant

Coulomb Constant

Coulomb Constant (kₑ) = 8.9876 × 10^+9 N·m²/C². 1/(4πε₀). Force between point charges. A electromagnetic constant in the free EngiRef reference, with 27 more…

electromagnetickₑ

Specification

Name
Coulomb Constant
Symbol
kₑ
Value
8.9876 × 10^+9
Unit
N·m²/C²
Category
electromagnetic
Description
1/(4πε₀). Force between point charges.

Constants

Related constants

Scientific constants

Vacuum Permittivity

Electric constant. Appears in Coulomb's law.

electromagneticε₀

Vacuum Permeability

Magnetic constant. Since the 2019 SI redefinition μ₀ is a measured quantity; 4π × 10⁻⁷ H/m is the pre-2019 exact value and now differs in the 10th digit.

electromagneticμ₀

Faraday Constant

Charge per mole of electrons. F = Nᴀ × e.

electromagneticF

Speed of Light in Vacuum

Exact defined value in SI. Maximum speed in universe.

fundamentalc

Planck Constant

Exact defined value in SI. Relates photon energy to frequency.

fundamentalh

Reduced Planck Constant

h/(2π). Common in quantum mechanics.

fundamentalℏ