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Electric susceptibility vs relative permitivity

  1. Mar 2, 2013 #1
    So for dielectrics, electric susceptibility (χ) is just the relative permittivity of the dielectric (κ) minus one?
    => χ = κ -1?

    Why? Doesn't this mean χ is a completely pointless constant? Just a different way to write κ?
  2. jcsd
  3. Mar 2, 2013 #2


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    Yes, it is simply sometimes convenient not to have to write -1 all the time.
  4. Mar 2, 2013 #3

    Meir Achuz

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    [tex]{\bf P=\chi E}[/tex].
    [tex]{\bf D=\kappa\epsilon_0 E}[/tex].
    [itex]\chi[/itex] and [itex]\kappa[/itex] are used in different relations.
    Last edited: Mar 2, 2013
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