relative permittivity

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

  1. bhuvanesh

    Thread Starter Member

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

    Active Member

    Aug 6, 2009
    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:
    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"!
    bhuvanesh likes this.
  3. Roca

    New Member

    Apr 18, 2014
    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.