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Related Concept Videos

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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Magnetic Force Between Two Parallel Currents01:13

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Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
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Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
Electrical Current01:10

Electrical Current

Electrical current is defined as the rate at which charge flows. When there is a large current present, such as that used to run a refrigerator, a large amount of charge moves through the wire in a small amount of time. If the current is small, such as that used to operate a handheld calculator, a small amount of charge moves through the circuit over a long period of time. The SI unit for current is the ampere (A), named for the French physicist André-Marie Ampère (1775–1836). An ampere is the...
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When a conductor is placed in an external electric field, the free charges in the conductor redistribute and very quickly reach electrostatic equilibrium. The resulting charge distribution and its electric field have many interesting properties, which can be investigated with the help of Gauss's law.
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Electrophysiological Recordings of Single-cell Ion Currents Under Well-defined Shear Stress
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Seismoelectric effect: a non-isochoric streaming current. 1. Experiment.

Andrei S Dukhin1, Philip J Goetz, Matthias Thommes

  • 1Dispersion Technology Inc., Bedford Hills, NY 10507, USA. adukhin@dispersion.com

Journal of Colloid and Interface Science
|March 9, 2010
PubMed
Summary

Seismoelectric currents, an electroacoustic effect, were measured in porous bodies using electroacoustic devices. This study confirms the technique

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Area of Science:

  • Geophysics
  • Materials Science
  • Acoustics

Background:

  • The seismoelectric effect describes the electric response generated by ultrasound propagation in liquid-saturated porous media.
  • The reverse electroseismic effect involves an electric field driving fluid motion.
  • Electroacoustic devices, typically used for liquid dispersions, can potentially measure seismoelectric currents.

Purpose of the Study:

  • To demonstrate the measurement of seismoelectric currents in various porous bodies using electroacoustic devices.
  • To validate the origin of the measured signals and extract information about porous material properties.
  • To investigate the applicability of electroacoustic devices beyond their original calibration purpose.

Main Methods:

  • Utilized electroacoustic devices, initially calibrated with liquid dispersions, to measure seismoelectric currents.
  • Applied the technique to three distinct porous materials: submicrometer particle deposits, porous glass spheres, and sandstone cores.
  • Monitored signal generation during deposit formation and correlated measurements with material characteristics like porosity and pore size.

Main Results:

  • Successfully measured seismoelectric currents in all tested porous bodies, confirming the technique's versatility.
  • Demonstrated that the seismoelectric effect is significant even with large, porous particles, contrary to classical theories.
  • Established a correlation between measured seismoelectric currents and the porosity of sandstone cores, even under high hydrodynamic resistance.

Conclusions:

  • Electroacoustic devices are effective tools for measuring seismoelectric currents in diverse porous geological materials.
  • The seismoelectric effect provides valuable insights into the microstructure and properties of porous media, including pore size and porosity.
  • This technique offers a promising non-invasive method for characterizing porous bodies relevant to geophysics and materials science.