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Electric Field outside a Coaxial Cable

  1. Sep 27, 2010 #1
    1. The problem statement, all variables and given/known data
    Consider an 8mm diameter coaxial cable, which consists of a central conducting wire, and an outer cylindrical conducting braid. If a charge of +30mC is placed on the inner conductor, and a charge of -30mC is placed on the outer conducting braid, what will the electric field, in N/C, be 4cm from the center of the cable?

    2. Relevant equations
    Gauss' Law

    3. The attempt at a solution
    I'm thinking it would be 0 but I don't know how to go about showing this.
  2. jcsd
  3. Sep 27, 2010 #2
    Please show how you reached this conclusion.
  4. Sep 28, 2010 #3
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