What Is Electromagnetic Induction?
Electromagnetic induction is the production of an EMF (and current in a closed loop) by a time-varying magnetic flux. Faraday's law: ε = −dΦB/dt, where ΦB = ∫ B · dA is the flux through the loop.
The minus sign (Lenz's law) means the induced current opposes the change of flux — a direct consequence of energy conservation. Discovered by Michael Faraday in 1831 and Joseph Henry independently.
Applications: power-station generators, transformers (the basis of the AC grid), induction cooktops, electric guitar pickups, MRI receive coils, wireless phone charging, metal detectors, and eddy-current brakes.
Recent research on this topic from arXiv
Preprints and papers indexed on arXiv.org. Links open the public abstract pages.
- On electromagnetic induction
Giuseppe Giuliani · 2000 ·arXiv:0008006v1
A general law for electromagnetic induction phenomena is derived from Lorentz force and Maxwell equation connecting electric field and time variation of magnetic field. The derivation provides with a unified mathematical treatment the state... - On the Laws of Electromagnetic Induction
Giovanni Romano · 2011 ·arXiv:1105.3340v2
The Faraday-Ampere laws of electro-magnetic induction are formulated in terms of plain and twisted differential forms, taking in due account the body motion in terms of Lie time-derivatives. Covariance of Lie derivatives with respect to arb... - Emergent electromagnetic induction beyond room temperature
Aki Kitaori, Naoya Kanazawa, Tomoyuki Yokouchi et al. · 2021 ·arXiv:2103.02814v1
Emergent electromagnetic induction based on electrodynamics of noncollinear spin states may enable dramatic miniaturization of inductor elements widely used in electric circuits, yet many issues are to be solved toward application. One such... - On electromagnetic induction in electric conductors
Alexander I. Korolev · 2013 ·arXiv:1303.0785v1
Experimental validation of the Faraday's law of electromagnetic induction (EMI) is performed when an electromotive force is generated in thin copper turns, located inside a large magnetic coil. It has been established that the electromotive...