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Homework Help: Symmetrical electric objects

  1. Sep 18, 2010 #1
    1. The problem statement, all variables and given/known data

    I need a strategy to resolve electrostatic problems such as the infinite cylindrical shell of radius r1 and r2 of non conducting material. I'm confused in applying a gaussian surface in this and others cases. Is there a recipe for it?

    2. Relevant equations

    Gauss's law.

    3. The attempt at a solution
  2. jcsd
  3. Sep 18, 2010 #2


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    Usually, the faces of a Gaussian surface are either perpendicular or parallel to the electric field. The faces that are parallel contribute nothing to the sum (or integral) of E·A (or E·dA). Also, the field is usually of equal magnitude over the faces where it is perpendicular, so those have a contribution of simply E·A.
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