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Electric Flux

  1. Nov 23, 2014 #1


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    Why is the electric flux defined as (electric field) x (area), Φ = EA? How do you come up with that equation? Is it because the electric flux is proportional to the charge and surface area?
  2. jcsd
  3. Nov 23, 2014 #2


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    Staff: Mentor

    That's close, although it's not quite right to say that it's proportional to the charge; you can get the same amount of flux through a given surface with a small charge nearby or a larger charge farther away. That's why the field strength E appears in the formula.
  4. Nov 24, 2014 #3
    Flux Is defined as the number of field Lines passing normally through a given area.
    Hence ## dR = E.dS = Edscosx ##
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