Spherical Capacitor (C = 4πε₀(ab)/(b-a))
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C = 4πε₀(ab)/(b-a)
What each symbol means
| Symbol | What it stands for |
|---|---|
| C | Capacitance (F) |
| a | Inner sphere radius (m) |
| b | Outer sphere radius (m) |
| ε₀ | Permittivity of free space = 8.85×10⁻¹² F/m |
When to use this
Concentric spherical shells. Inner at +Q, outer at −Q. As b → ∞, C → 4πε₀a (isolated sphere). With dielectric: multiply by K.