Physics › Section Q · Electromagnetic induction and AC circuits › Topic Q.2
Motional emf and eddy currents
Move a conductor through a magnetic field and an emf appears in it, even though the field itself never changes. The same effect swirls currents through solid metal, and those currents brake roller coasters, sort scrap and heat pans.
In this topic
- Moving wires, steady fields
- The flux view: emf = Blv
- The force view
- Worked example: a rod on rails
- Worked example: an aircraft's wings
- Eddy currents
- Drag that depends on speed
- Worked example: magnetic brakes on a ride
- Eddy currents at work
- Common mistakes to avoid
- Key takeaways
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