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Homework Help: Net electric flux through torus

  1. Jan 29, 2007 #1
    1. The problem statement, all variables and given/known data
    What is the net electric flux through the torus (i.e., doughnut shape) of the figure

    2. Relevant equations

    net flux= E*A I believe is needed

    3. The attempt at a solution
    I don't know how to do this problem at all. I feel like I don't have enough information to calculate the answer. Any advice as how to start this problem because I don't have the radius of the objects so how can I figure out the area.

    Attached Files:

  2. jcsd
  3. Jan 30, 2007 #2


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    Homework Helper

    Use Gauss's law. The enclosed charge is - 1 nC if you choose the torus as the closed surface. It is a closed surface since it has an outer and inner surface and one cannot pass from the one to the other.
  4. Sep 12, 2008 #3
    I had the same problem! you are right! thanks~
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