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I Dielectric Electric field

  1. Dec 27, 2016 #1
    I understand that as a solid melts, it increases can increase in polarizability of the medium, and increase the Dielectric constant (K).
    -ex. like dissolving NaCl and having ions in solution.

    Why does Thermal motion reduce the polarizability of the medium, thus decreasing the dielectric constant?
    Is it because when a strongly polar medium respond to an external electric field, the medium reorienting its polar molecules so that the net electric field within the medium becomes weaker than the external field?
  2. jcsd
  3. Dec 27, 2016 #2

    Paul Colby

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    Gold Member

    When a field is applied to a dielectric the composite dipoles align so as to reduce their potential energy. Thermal agitation will on average raise the dipole energy decreasing the net polarization or alignment.
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