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Help understanging Gauss's Law

  1. Aug 16, 2008 #1
    1. The problem statement, all variables and given/known data
    Hi all,

    I'm having some difficulty with electric flux.

    Does electric flux stay the same if you double the diameter of a circle assuming the electric field is uniform?

    Any help would be much appreciated.


    2. Relevant equations

    Electric flux= E.A

    where A is area.

    3. The attempt at a solution

    If diameter if doubled then I beleive that the electric flux will also double (area is doubled, and flux is proportianal)

    Or does it stay the same?
  2. jcsd
  3. Aug 16, 2008 #2


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    Science Advisor
    Homework Helper

    Doubling the diameter changes the area by a factor of four. If you double the area (not the diameter) and keep the E field the same, the flux will double. But is that really the question you want to ask? If the charge remains the same the flux won't change. Because the E field will go down by a factor of 1/2.
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