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Related Concept Videos

Electromagnetic Fields01:30

Electromagnetic Fields

2.3K
Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
However, the observation of...
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Electric Field of Two Equal and Opposite Charges01:30

Electric Field of Two Equal and Opposite Charges

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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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Electric Field Lines01:25

Electric Field Lines

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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...
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Calculations of Electric Potential II01:27

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An electric dipole is a system of two equal but opposite charges, separated by a fixed distance. This system is used to model many real-world systems, including atomic and molecular interactions. One of these systems is the water molecule, but only under certain circumstances. These circumstances are met inside a microwave oven, where electric fields with alternating directions make the water molecules change orientation. This vibration is equivalent to heat at the molecular level.
Consider a...
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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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Finding Electric Potential From Electric Field01:13

Finding Electric Potential From Electric Field

4.7K
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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Finite Element Modelling of a Cellular Electric Microenvironment
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Electric fields and potentials in condensed phases.

Shawn M Kathmann1

  • 1Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA. shawn.kathmann@pnnl.gov.

Physical Chemistry Chemical Physics : PCCP
|October 14, 2021
PubMed
Summary
This summary is machine-generated.

Understanding electric fields and potentials within matter is key for controlling chemical and physical processes. This study compares classical and quantum mechanical models, highlighting electron holography for better electrostatic insights.

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Area of Science:

  • Physics, chemistry, and biology
  • Electrostatics in matter

Background:

  • Accurate quantification of electric fields and potentials is crucial for controlling chemical and physical transformations.
  • Understanding intrinsic interior and interfacial fields and potentials is essential before studying matter's response to external fields.

Purpose of the Study:

  • To compare and contrast classical and quantum mechanical electric potentials and fields within matter.
  • To connect theoretical models with experimental probes and identify conceptual difficulties.
  • To highlight the advantages of electron holography for studying electrostatics in matter.

Main Methods:

  • Comparison of classical and quantum mechanical models for electric potentials and fields.
  • Analysis of systems ranging from a hydrogen atom to concentrated aqueous NaCl electrolyte.
  • Review of experimental techniques including vibrational Stark, electrochemical, X-ray, and electron spectroscopy.

Main Results:

  • Demonstration of both classical and quantum mechanical electric potentials and fields across different systems.
  • Identification of conceptual challenges in quantifying these fields and potentials.
  • Validation of electron holography as a powerful tool for electrostatic analysis.

Conclusions:

  • A comprehensive comparison of theoretical and experimental approaches to electric fields and potentials in matter.
  • Electron holography offers significant advantages for understanding electrostatics within materials.
  • Further research into theoretical and experimental methods is needed for precise quantification.