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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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Electric Field of Parallel Conducting Plates01:16

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Gauss' law relates the electric flux through a closed surface to the net charge enclosed by that surface. Gauss's law can be applied to find the electric field and the charge enclosed in a region depending on its charge distribution.
Consider a cross-section of a thin, infinite conducting plate having a positive charge. For such a large thin plate, as the thickness of the plate tends to zero, the positive charges lie on the plate's two large faces. Without an external electric...
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Electrostatic Boundary Conditions in Dielectrics01:27

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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
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Induced Electric Fields01:23

Induced Electric Fields

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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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Electric Field at the Surface of a Conductor01:26

Electric Field at the Surface of a Conductor

4.8K
Consider a conductor in electrostatic equilibrium. The net electric field inside a conductor vanishes, and extra charges on the conductor reside on its outer surface, regardless of where they originate.
In the 19th century, Michael Faraday conducted the famous ice pail experiment to prove that the charges always reside on the surface of a conductor. The experimental set-up consists of a conducting uncharged container mounted on an insulating stand. The outer surface of the container is...
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Electric Field of Two Equal and Opposite Charges01:30

Electric Field of Two Equal and Opposite Charges

6.4K
Atoms generally contain the same number of positively and negatively charged particles, protons, and electrons. Hence, they are electrically neutral. However, the centers of the positive and negative charges do not always coincide. In such a scenario, the electric field of an atom may not be zero.
A separation of the positive and negative charges can lead to a weak, remnant effect of the positive and negative charges. The expectation is that the more the distance between the positive and...
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Related Experiment Video

Updated: Oct 2, 2025

Light Enhanced Hydrofluoric Acid Passivation: A Sensitive Technique for Detecting Bulk Silicon Defects
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Effect of Electric Fields on Silicon-Based Monolayers.

Tiexin Li1, Chandramalika Peiris1, Essam M Dief1

  • 1School of Molecular and Life Sciences, Curtin University, Bentley 6102, Western Australia, Australia.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 28, 2022
PubMed
Summary

Electric fields cause silicon-based monolayers to desorb and silicon to oxidize. This impacts the design of molecular electronics and understanding charge transfer in these systems.

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Area of Science:

  • Surface chemistry
  • Materials science
  • Electrochemistry

Background:

  • Electric fields influence chemical reactions and molecular structures on surfaces.
  • Silicon-based monolayers are crucial for molecular electronics and surface functionalization.

Purpose of the Study:

  • To investigate the stability and behavior of silicon-based organic monolayers under applied electric fields.
  • To understand the impact of electric fields on monolayer coverage, electron transfer rates, and underlying silicon oxidation.

Main Methods:

  • Applying electrochemical potentials (+1.5 V vs Ag/AgCl) to Si-based monolayers.
  • Utilizing conducting atomic force microscopy (C-AFM) with a +5 V bias on Si-based monolayers.
  • Analyzing changes in surface coverage, electron transfer rate constants (k_et), and oxide growth via current-voltage measurements.

Main Results:

  • Electrochemical potential (+1.5 V) caused 28% monolayer desorption and 55% reduction in electron transfer rate constant (k_et) after 10 min.
  • C-AFM (+5 V) induced complete monolayer desorption at specific sites and 2.6 nm average silicon oxide growth within 8 min.
  • Current-voltage plots shifted from rectifying to insulating with increasing oxide thickness, indicating semiconductor junction degradation.

Conclusions:

  • Si-based organic monolayers exhibit limited stability under applied electric fields, undergoing desorption and silicon oxidation.
  • These findings are critical for designing robust silicon-based monolayers for molecular electronics.
  • Understanding electric field effects is essential for accurate interpretation of charge-transfer kinetics in such systems.