Coulomb's constant and permittivity (k = 1/(4πε₀))
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k = 1/(4πε₀)
What each symbol means
| Symbol | What it stands for |
|---|---|
| k | Coulomb constant ≈ 8.99×10⁹ N·m²/C² |
| \varepsilon_0 | Vacuum permittivity ≈ 8.85×10⁻¹² F/m |
When to use this
k and \varepsilon_0 are equivalent constants in SI vacuum electrostatics.