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Parralel Plate capacitor

  1. Nov 12, 2011 #1
    Just wondering if the formula C=εA/d is a realistic formula for a parallel plate capacitor, surely its making an approximation about the plates being HUGE or that at the edges the electric field doesn't go in nice straight lines from one plate to the other?

    If it is an approximation does anyone know the more accurate formula
     
  2. jcsd
  3. Nov 12, 2011 #2
    Yes, it is an accurate formula. Why do you doubt it?
     
  4. Nov 12, 2011 #3
    I just thought that effects at the edge of the plate would affect it slightly
     
  5. Nov 12, 2011 #4
    It does affect. But i guess the error of not taking into account is negligible!
    Its called fringe effect in capacitor.
     
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