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Induction01:16

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An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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Epilepsy is a chronic neurological disease marked by recurrent, unpredictable seizures. These seizures are caused by abnormal electrical discharges in the brain, leading to behavior, sensation, or consciousness alterations. They can also cause transient impairment of awareness, interfering with daily activities.
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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
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Related Experiment Video

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Dynamic effect of electromagnetic induction on epileptic waveform.

Yuqin Sun1, Yuting Chen1, Hudong Zhang1

  • 1School of Mathematics and Physics, Shanghai University of Electric Power, Shanghai, 201306, China.

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|December 19, 2022
PubMed
Summary

Electromagnetic induction influences neuronal activity and epilepsy. This study reveals memristors can both reduce and induce pathological states, offering insights for targeted epilepsy therapies.

Keywords:
Absence seizuresCoupled modelElectromagnetic inductionHopf bifurcationSpike and wave discharges

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Area of Science:

  • Neuroscience
  • Computational Biology
  • Epilepsy Research

Background:

  • Electromagnetic induction's role in neuronal activity is increasingly recognized.
  • The link between electromagnetic induction and epilepsy mechanisms, particularly dynamic aspects, remains underexplored.

Purpose of the Study:

  • To investigate the dynamic mechanisms of epilepsy transitions influenced by electromagnetic induction.
  • To explore the dual role of memristors in modulating epileptic discharges.

Main Methods:

  • A modified two-compartment cortical thalamus model was developed.
  • Eight key bifurcation parameters were analyzed, including Hopf bifurcations (HB), fold of cycle bifurcations (LPC), and torus bifurcations (TR).
  • Memristor applications in single-compartment and coupled models were compared.

Main Results:

  • The coupled model demonstrated an increased capacity to trigger diverse discharge states due to inter-compartment driving effects.
  • Memristors exhibited a dual effect: reducing tonic discharges while also potentially inducing novel pathological states.
  • Bifurcation diagrams elucidated the dynamic mechanisms underlying abundant discharge activities.

Conclusions:

  • This research clarifies the influence of memristors on different brain regions, providing a theoretical basis for targeted epilepsy therapies.
  • The findings offer new perspectives on the involvement of electromagnetic induction in absence seizures.