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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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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
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Magnetically Induced Rotating Rayleigh-Taylor Instability
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How does relativity affect magnetically induced currents?

R J F Berger1, M Repisky, S Komorovsky

  • 1Chemistry of Materials, Paris-Lodron-University Salzburg, Hellbrunner Str. 34, A-5020 Salzburg, Austria. Raphael.Berger@sbg.ac.at.

Chemical Communications (Cambridge, England)
|August 6, 2015
PubMed
Summary
This summary is machine-generated.

Relativistic theory reveals that spin-orbit coupling (SOC) creates unique magnetic effects in molecules. These effects cause unusual current patterns and distortions, particularly in compounds like AuH and HgH2.

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Area of Science:

  • Theoretical Chemistry
  • Quantum Mechanics
  • Molecular Physics

Background:

  • Understanding electron behavior in molecules is crucial for predicting chemical properties.
  • Relativistic effects become significant for heavy elements, influencing electronic structure.
  • Spin-orbit coupling (SOC) plays a key role in the behavior of electrons in heavy atoms.

Purpose of the Study:

  • To investigate magnetically induced probability currents in molecules using relativistic theory.
  • To explore the impact of spin-orbit coupling (SOC) on molecular electronic structure and currents.
  • To identify and characterize novel current phenomena arising from relativistic effects.

Main Methods:

  • Employing relativistic quantum chemistry calculations.
  • Analyzing magnetically induced spin-density.
  • Studying the behavior of probability currents in molecules like AuH and HgH2.

Main Results:

  • Spin-orbit coupling (SOC) was found to enhance the curvature of probability currents.
  • A previously unobserved current cusp was identified in AuH.
  • Bulge-like distortions in probability currents were observed in HgH2 at proton positions.

Conclusions:

  • Relativistic effects, specifically SOC, significantly alter molecular probability currents.
  • The findings reveal new phenomena in the electronic behavior of heavy-element molecules.
  • This research provides a deeper understanding of magnetism and electron dynamics in molecules.