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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...
Carrier Generation and Recombination01:22

Carrier Generation and Recombination

Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

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 permittivity.
Electrostatic Boundary Conditions01:16

Electrostatic Boundary Conditions

Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
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...

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Related Experiment Video

Updated: May 26, 2026

Finite Element Modelling of a Cellular Electric Microenvironment
08:23

Finite Element Modelling of a Cellular Electric Microenvironment

Published on: May 18, 2021

Biological cell-electrical field interaction: stochastic approach.

A K Dubey, M Banerjee, Bikramjit Basu

    Journal of Biological Physics
    |January 3, 2012
    PubMed
    Summary
    This summary is machine-generated.

    This study models how biological cells interact with electric fields using stochasticity. Noise in nuclear membrane capacitance significantly impacts cell current flow, explained by physical and structural properties.

    Keywords:
    Biological cellE-fieldMicro-organellesStochasticity

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    Area of Science:

    • Biophysics
    • Computational Biology
    • Cellular Electrophysiology

    Background:

    • Understanding cell response to external electric fields is crucial in various biological and medical applications.
    • Stochastic models offer a framework to capture the inherent variability and complexity of biological systems.

    Purpose of the Study:

    • To develop and implement a stochastic model for simulating biological cell-electric field interactions.
    • To identify key parameters influencing cellular response to electric fields.

    Main Methods:

    • Implementation of a stochastic model incorporating varying forcing intensities in parameters.
    • Analysis of the impact of noise on different cellular components, particularly the nuclear membrane.

    Main Results:

    • The stochastic model provides a realistic description of cell-electric field interactions.
    • Noise in nuclear membrane capacitance was identified as the most influential factor on current flow.
    • A physical and structural explanation for the nuclear membrane's significant role was proposed.

    Conclusions:

    • Stochastic modeling is effective for simulating cell-electric field interactions.
    • Nuclear membrane capacitance noise is a critical determinant of cellular electrophysiological response.
    • Further investigation into the physical and biological basis of nuclear membrane behavior in electric fields is warranted.