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The relative permittivity of a dielectric is always

  • A.negative for materials with permanent dipoles
  • B.greater than unity
  • C.less than unity
  • D.equal to unity

Answer: B

Polarisation always acts to oppose the applied field within the medium, which corresponds to a positive susceptibility and therefore a relative permittivity above one. Values range from about 1.0006 for air to several thousand for some ceramics.

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