Equations
Magnetic field of a long straight wire
Electricity and magnetism · id wire_magnetic_field
B = \frac{\mu_0 I}{2 \pi r}
| Symbol | Quantity | Unit | Meaning | Usual range |
|---|---|---|---|---|
B | magnetic field | T | Field strength at distance r | 0 to 100 |
mu0 | magnetic constant | N/A^2 | Vacuum permeability | |
I | current | A | Current in the wire | 0 to 10000 |
r | distance | m | Distance from the wire | 1e-06 to 10000 |
Assumptions
- Long straight wire
- Vacuum or air around the wire
Valid when
- No extra conditions.
Found by
Questions with these words retrieve this equation: magnetic field, straight wire, current, power line, tesla, distance from wire.
Source
OpenStax University Physics Volume 2, Chapter 12 (reference; entry written by the project). License: MIT. Entry confidence: 0.99.