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Related Concept Videos

Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
Susceptibility, Permittivity and Dielectric Constant01:26

Susceptibility, Permittivity and Dielectric Constant

When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.

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Related Experiment Video

Updated: Jul 12, 2026

Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
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Lunar pemafrost: dielectric identification.

R Alvarez

    Science (New York, N.Y.)
    |March 16, 1973
    PubMed
    Summary

    Lunar permafrost simulation reveals dielectric relaxation around 300 Hz at 100 K. This finding suggests lunar permafrost, if present, would exhibit similar dielectric properties, aiding in its detection and characterization.

    Area of Science:

    • Geophysics
    • Planetary Science
    • Materials Science

    Background:

    • Lunar permafrost is a potential resource for future missions.
    • Understanding its dielectric properties is crucial for remote sensing and in-situ detection.
    • Previous studies have lacked detailed dielectric relaxation data for lunar permafrost conditions.

    Purpose of the Study:

    • To simulate lunar permafrost conditions and measure its dielectric relaxation.
    • To determine the characteristic dielectric relaxation frequencies of lunar permafrost at relevant temperatures.
    • To provide data that can aid in the identification and characterization of lunar permafrost.

    Main Methods:

    • A simulator was constructed to replicate lunar permafrost conditions at 100 Kelvin.

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  • Dielectric relaxation measurements were performed on the simulated lunar permafrost.
  • The frequency-dependent dielectric response was analyzed.

    • Main Results:

    • A dielectric relaxation peak was observed at approximately 300 Hertz for the simulated lunar permafrost at 100 K.
    • Theoretical extrapolation suggests this 300 Hz peak would be present if lunar permafrost exists between 100 K and 213 K.
    • At higher temperatures, up to 263 K, the relaxation frequency could extend up to 20 kilohertz.

    Conclusions:

    • The study provides a key dielectric signature for lunar permafrost.
    • The findings indicate that dielectric measurements could be used to detect and characterize lunar permafrost.
    • Further research should validate these findings with in-situ measurements and explore a wider range of lunar regolith compositions.