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Related Concept Videos

Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

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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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Induced Electric Fields01:23

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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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Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
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Significance of Displacement Current01:27

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A displacement current is analogous to a real current in Ampère's law, participating in Ampère's law the same way as the usual conduction current. However, it is produced by a changing electric field. Displacement current is defined in terms of a time-varying electric field, and also has an associated displacement current density. By adding a term accounting for displacement current, Maxwell modified the existing Ampère's law, which is now called generalized Ampère's law.
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Induced Electric Dipoles01:28

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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Finding Electric Potential From Electric Field01:13

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For a system of charges, it is easy to calculate the system's potential because potential is a scalar quantity. However, in some instances where calculating the electric field is more straightforward than finding the potential, the electric field is used to calculate the system's potential. For a positive charge, the electric field is radially outward, and the potential is positive at any finite distance from the positive charge. In such an electric field, the motion away from the...
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External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures
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Harnessing dislocation motion using an electric field.

Mingqiang Li1,2, Yidi Shen3, Kun Luo3

  • 1Department of Materials Science and Engineering, University of Toronto, Toronto, Ontario, Canada.

Nature Materials
|June 19, 2023
PubMed
Summary
This summary is machine-generated.

Scientists have demonstrated electric field control over dislocation motion in zinc sulfide crystals. This breakthrough allows for manipulation of material properties without mechanical force, opening new avenues in materials science.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Crystallography

Background:

  • Dislocation motion is fundamental to crystal plasticity, influencing material hardening and processing.
  • Current methods for controlling dislocations primarily rely on mechanical loading.
  • Manipulating dislocation dynamics using non-mechanical fields has been a long-standing challenge.

Purpose of the Study:

  • To investigate the control of dislocation motion using an external electric field.
  • To reveal the charge characteristics and core nature of dislocations.
  • To establish a non-mechanical method for modulating dislocation dynamics.

Main Methods:

  • Real-time observation of dislocation movement in single-crystalline zinc sulfide under an applied electric field.
  • Analysis of dislocation core structures and their charge properties.
  • Measurement of glide barriers under varying electric field conditions.

Main Results:

  • Dislocation motion was successfully controlled solely by an external electric field, with reversible movement observed.
  • Non-stoichiometric dislocation cores were identified, exhibiting both negative and positive charges.
  • Applied electric fields were shown to decrease dislocation glide barriers, explaining the observed motion.

Conclusions:

  • Direct evidence of dislocation dynamics controlled by a non-mechanical stimulus (electric field) has been established.
  • The findings demonstrate the potential for electric field-induced manipulation of dislocation behavior.
  • This research opens new possibilities for controlling material properties through electric field interactions with dislocations.