Equations
Average emf when a field through a coil switches off
Electricity and magnetism · id faraday_average_emf
\mathcal{E} = \frac{N B A}{\Delta t}
| Symbol | Quantity | Unit | Meaning | Usual range |
|---|---|---|---|---|
emf | average induced emf | V | Average voltage induced in the coil | 0 to 1e+06 |
N | number of turns | dimensionless | Turns in the coil | 1 to 100000 |
B | magnetic field | T | Initial field through the coil, perpendicular to it | 1e-09 to 50 |
A | coil area | m^2 | Area of each turn | 1e-08 to 100 |
t | time | s | Time for the field to drop to zero | 1e-09 to 10000 |
Assumptions
- Field perpendicular to the coil
- Field falls to zero at a steady rate
Valid when
- No extra conditions.
Found by
Questions with these words retrieve this equation: faraday, induction, induced emf, coil, turns, magnetic flux, generator.
Source
OpenStax University Physics Volume 2, Chapter 13 (reference; entry written by the project). License: MIT. Entry confidence: 0.98.