Moving charges produce magnetic fields; this chapter discovers the opposite symmetry: a magnetic field that changes in time produces an electric field, capable of setting the charges of a conductor in motion and generating a current. This is electromagnetic induction, discovered by Michael Faraday in 1831. From magnetic flux and the Faraday-Neumann-Lenz law we arrive at self-induction, LC and RLC oscillating circuits, and alternating current with reactances, impedance and phasors.
Sections
- The paradox that introduces induction
- Flux of the magnetic field
- The Faraday-Neumann law
- Lenz’s law as an autonomous principle
- Eddy currents and industrial applications
- Inductance and self-induction
- dt = ±i
- LC circuits: electromagnetic oscillations
- Alternating current: driven RLC circuits