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Homework Help: Electric field of a cylinderical insulator

  1. Jul 3, 2009 #1
    1. The problem statement, all variables and given/known data
    A long cylindrical insulator has a uniform charge density of 1.79 µC/m and a radius of 3 cm. What is the electric field inside the insultor at a distance of (a) 2 cm? [Answer in units of N/C] (b) 10 cm.

    2. Relevant equations
    ∫ E • dA = Q_enclosed / e_0

    3. The attempt at a solution
    I know I have to use Gauss’ Law by constructing a cylindrical Gaussian surface of radius r (r<R) and length l. However, I can't seem to figure out how to get the height to cancel out since it isn't given in the question.
    Last edited: Jul 3, 2009
  2. jcsd
  3. Jul 3, 2009 #2
    I figured out part a, but I'm still stuck on b.
  4. Jul 3, 2009 #3
    Figured out part b.
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