relative permittivity

Discussion in 'Physics' started by bhuvanesh, Apr 12, 2014.

  1. bhuvanesh

    Thread Starter Member

    Aug 10, 2013
    268
    2
    what is the effect of relative permittivity in respect to current.air has low and water has high relative permitivity.how does it affect the electric field.
     
    Last edited: Apr 12, 2014
  2. daviddeakin

    Active Member

    Aug 6, 2009
    207
    27
    Materials with higher permittivity can "hold" a higher density of electric flux for a given electric field strength. Or, looking at it the other way, for a given flux, the electric field strength will decrease as permittivity increases (putting it crudey, you need less voltage to make a given amount of flux 'flow' in the material*)

    Remember the formula for capacitance:
    C=εA/d
    More permittivity (ε) means more capacitance, which means it holds more charge for a given voltage. More charge means more flux.

    *flux does not actually "flow" anywhere; it simply exists in a given volume. But it can be tricky to talk abut it in everyday language without using the word "flow"!
     
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  3. Roca

    New Member

    Apr 18, 2014
    3
    0
    I have read to that it may also be related to the intensity of a electric flux. (Just as permeability for magnetic flux). As daviddeakin explained, the capacitance formula is a good example to easily see that.
     
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