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Related Concept Videos

Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

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...
Induction01:16

Induction

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.
A...
Induced Electric Fields01:23

Induced Electric Fields

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...
Magnetic Fields01:27

Magnetic Fields

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.
A magnetic field is defined by the force that a charged particle experiences...
Faraday's Law01:10

Faraday's Law

Faraday's law state that the induced emf is the negative change in the magnetic flux per unit of time. Any change in the magnetic field or change in the orientation of the area of the coil with respect to the magnetic field induces a voltage (emf). The magnetic flux measures the number of magnetic field lines through a given surface area. Magnetic flux is estimated from the integral of the dot product of the magnetic field vector and the area vector. The negative sign describes the direction in...
Energy In A Magnetic Field01:24

Energy In A Magnetic Field

If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus negligible.
The energy...

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Updated: May 30, 2026

Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish
07:47

Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish

Published on: March 18, 2019

The induced magnetic field.

Rafael Islas1, Thomas Heine, Gabriel Merino

  • 1Departamento de Química, Universidad de Guanajuato, Gto. México.

Accounts of Chemical Research
|August 19, 2011
PubMed
Summary
This summary is machine-generated.

Induced magnetic fields reveal electron delocalization and aromaticity in diverse molecules. This method quantifies electron distribution, aiding understanding of chemical behavior in planar and nonplanar systems.

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External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures
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External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures

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Area of Science:

  • * Quantum chemistry
  • * Theoretical chemistry
  • * Spectroscopy

Background:

  • * Aromaticity is crucial for understanding chemical reactivity, structure, stability, and spectroscopy.
  • * Electron delocalization, particularly of π-electrons, drives stabilization in planar molecules.
  • * Delocalized systems generate long-range induced magnetic fields sensitive to external fields.

Purpose of the Study:

  • * To introduce and validate the use of induced magnetic fields for quantifying electron delocalization and aromaticity.
  • * To apply this method to a wide range of uncommon planar and nonplanar molecules.
  • * To refine the method for analyzing core, σ-, and π-electron contributions.

Main Methods:

  • * Calculation of induced magnetic fields generated by molecular electronic systems.
  • * Application to diverse aromatic, antiaromatic, and nonaromatic compounds, including inorganic systems.
  • * Dissection of induced fields into orbital contributions.

Main Results:

  • * Planar molecules consistently exhibit significant π-electron delocalization, with some showing σ-framework delocalization.
  • * Long-range induced magnetic fields are dominated by contributions from delocalized π-systems.
  • * Different aromaticity types (aromatic, antiaromatic, nonaromatic) show distinct responses to external magnetic fields.

Conclusions:

  • * Induced magnetic fields provide a versatile analytical probe for electron delocalization and aromaticity.
  • * The method is particularly effective for planar, densely packed systems.
  • * It offers insights comparable to experimental techniques like NMR chemical shifts and complements existing theoretical models.