Surface Charge Density Converter
Surface charge density (σ) measures electric charge distributed over a surface. Important for conducting plates, capacitors, and semiconductor junctions. Enter any value to convert instantly.
Common Surface Charge Density Conversions
| From | To |
|---|---|
| 1 C/m² | 0.0001 C/cm² |
| 1 C/cm² | 10,000 C/m² |
| 1 µC/m² | 0.000001 C/m² |
| 1 mC/m² | 0.001 C/m² |
| 1 µC/cm² | 0.01 C/m² |
| 1 nC/m² | 10⁻⁹ C/m² |
Surface Charge Density Unit Definitions
- C/m² (coulombs/m²)
- SI unit of surface charge density.
- C/cm²
- 10,000 C/m². Historical CGS unit.
- µC/m² (microcoulombs/m²)
- Typical for semiconductor surfaces.
- mC/m² (millicoulombs/m²)
- Used for moderately charged surfaces.
Frequently Asked Questions
What is the charge density on a capacitor plate?
σ = Q/A, where Q is total charge and A is plate area. For a 10 µF capacitor at 10 V with 10 cm² plates: σ = 100 µC/cm².
What are typical surface charge density values?
Semiconductor surfaces: ~10⁻⁴ C/m². Glass rubbed with silk: ~1 µC/m². Electret films: up to 1 mC/m².
How does surface charge density relate to electric field?
For a conducting plane: E = σ/ε₀ just above the surface. For a parallel-plate capacitor: E = σ/ε₀ between plates.