Equations
Coulomb's law
Electricity and magnetism · id coulomb_law
F = \frac{k q_1 q_2}{r^2}
| Symbol | Quantity | Unit | Meaning | Usual range |
|---|---|---|---|---|
F | electric force | N | Magnitude of the force between the charges | 0 to 1e+12 |
k | Coulomb constant | N*m^2/C^2 | 1/(4 pi epsilon_0) | |
q1 | charge 1 | C | Magnitude of the first charge | 1e-12 to 0.01 |
q2 | charge 2 | C | Magnitude of the second charge | 1e-12 to 0.01 |
r | separation | m | Distance between the charges | 1e-06 to 10000 |
Assumptions
- Point charges
- Charges at rest in vacuum
Valid when
- No extra conditions.
Found by
Questions with these words retrieve this equation: coulomb, electric force, charge, repel, attract, electrostatic, static.
Source
OpenStax University Physics Volume 2, Chapter 5 (reference; entry written by the project). License: MIT. Entry confidence: 0.99.