Electrical Engineering › Section H · Magnetic circuits and inductors › Topic H.1
Magnetic fields, flux density, and permeability
Motors, transformers, relays, loudspeakers and every inductor work through magnetic fields. This topic sets up the three quantities you need to describe those fields in a circuit: flux, flux density and permeability.
In this topic
- Why magnetism belongs in a circuits course
- Field lines and what they show
- Fields made by currents
- Flux and flux density
- Worked example: flux density in a core
- Flux through a tilted surface
- Worked example: a loop at an angle
- Force on a current: what a tesla means
- Permeability
- Relative permeability and material classes
- Common mistakes to avoid
- Key takeaways
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