Physics › Section Q · Electromagnetic induction and AC circuits › Topic Q.1
Induced emf, Faraday's law, and Lenz's law
Currents make magnetic fields, and in 1831 Michael Faraday showed the reverse: a changing magnetic field can drive a current. That discovery, with Lenz's rule for its direction, is the working principle behind every generator, transformer and wireless charger.
In this topic
- Currents from changing fields
- Magnetic flux
- Faraday's law
- Worked example: a coil in a growing field
- Lenz's law
- Finding the direction, step by step
- Worked example: a magnet approaching a loop
- Worked example: turning a coil
- Induction at work
- Common mistakes to avoid
- Key takeaways
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