Equations
Electric field of a point charge
Electricity and magnetism · id point_charge_field
E = \frac{k q}{r^2}
| Symbol | Quantity | Unit | Meaning | Usual range |
|---|---|---|---|---|
E | electric field | N/C | Field strength at distance r | 0 to 1e+14 |
k | Coulomb constant | N*m^2/C^2 | 1/(4 pi epsilon_0) | |
q | charge | C | Magnitude of the source charge | 1e-12 to 0.01 |
r | distance | m | Distance from the charge | 1e-06 to 10000 |
Assumptions
- Point charge at rest in vacuum
Valid when
- No extra conditions.
Found by
Questions with these words retrieve this equation: electric field, point charge, field strength, charge, newtons per coulomb.
Source
OpenStax University Physics Volume 2, Chapter 5 (reference; entry written by the project). License: MIT. Entry confidence: 0.99.