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Related Concept Videos

Determining Electric Field From Electric Potential01:12

Determining Electric Field From Electric Potential

The electric field and electric potential are related to each other. If the electric field at various points in the region of interest is known, it can be used to calculate the electric potential difference between any two points. Similarly, if the electric potential is known for various points, then it is possible to calculate the electric field.
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
Electric Field at the Surface of a Conductor01:26

Electric Field at the Surface of a Conductor

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...
Electric Field Lines01:25

Electric Field Lines

The three-dimensional representation of the electric field of a positive point charge requires tracing the electric field vectors, whose lengths decrease as the square of their distance from the charge and which point away from the charge at each point. This vector field is no doubt challenging to visualize. The visualization of electric fields becomes quickly intractable as the number of charges increases.
The solution to this problem is to use electric field lines, which are not vectors but...
Electric Field of a Non Uniformly Charged Sphere01:22

Electric Field of a Non Uniformly Charged Sphere

Gauss's law states that the electric flux through any closed surface equals the net charge enclosed within the surface. This law is beneficial for determining the expressions for the electric field for a particular charge distribution if the electric flux is known.
Consider a non-uniformly charged sphere, for which the density of charge depends only on the distance from a point in space and not on the direction. Such a sphere has a spherically symmetrical charge distribution. Here, the electric...
Finding Electric Potential From Electric Field01:13

Finding Electric Potential From Electric Field

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 positive...
Electric Field of Two Equal and Opposite Charges01:30

Electric Field of Two Equal and Opposite Charges

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: May 30, 2026

Finite Element Modelling of a Cellular Electric Microenvironment
08:23

Finite Element Modelling of a Cellular Electric Microenvironment

Published on: May 18, 2021

Electron holography study of electric field variations.

Daisuke Shindo1, Yasukazu Murakami

  • 1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan. shindo@tagen.tohoku.ac.jp

Journal of Electron Microscopy
|August 17, 2011
PubMed
Summary

This review highlights electron holography

Area of Science:

  • Materials Science
  • Applied Physics
  • Electron Microscopy

Background:

  • Electron holography is a powerful technique for visualizing electrostatic and magnetic fields.
  • Multifunctional specimen holders enable advanced in-situ experiments.
  • Understanding electric field variations is crucial for various electronic and biological applications.

Purpose of the Study:

  • To review recent electron holography studies on electric field variations.
  • To showcase the capabilities of multifunctional specimen holders in electric field analysis.
  • To explore diverse applications of electron holography in materials and biological sciences.

Main Methods:

  • Electron holography with advanced specimen holders.
  • Inner potential analysis.

More Related Videos

Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization
06:58

Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization

Published on: July 12, 2016

Related Experiment Videos

Last Updated: May 30, 2026

Finite Element Modelling of a Cellular Electric Microenvironment
08:23

Finite Element Modelling of a Cellular Electric Microenvironment

Published on: May 18, 2021

Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization
06:58

Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization

Published on: July 12, 2016

  • In-situ electric field measurements and current application.
  • Shielding specimens from electron irradiation.

    • Main Results:

    • Analysis of electric field variations around field emission tips.
    • Quantification of charges and electric fields in electrophotographic materials.
    • Evaluation of conductivity and electric field changes in conductive adhesives.
    • Study of electron irradiation effects on biological specimens.

    Conclusions:

    • Multifunctional specimen holders significantly enhance electron holography's capability for electric field analysis.
    • Electron holography provides quantitative insights into electric fields in diverse materials.
    • This technique offers potential for understanding charging effects and electron dynamics.