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Just a bit confused with Gauss's Law

  1. May 2, 2014 #1
    1. The problem statement, all variables and given/known data

    So I was looking at this site reading up again on Gauss's Law and was a tad confused

    http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elecyl.html

    1st thing on the page...

    2. Relevant equations



    3. The attempt at a solution

    It states that the electric flux will just be the Electric field times the area of the cylinder...

    However in the calculation, the circumference of the cylinder is used...why is that?
     
  2. jcsd
  3. May 2, 2014 #2

    Doc Al

    User Avatar

    Staff: Mentor

    The circumference times the length L gives the surface area.
     
  4. May 2, 2014 #3
    Oh okay! I was taking into account the full area but since the Electric field lines will never cross through the 2 ends of the cylinder the area needed will just be the circumference times the length..

    Thank you Doc Al!
     
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