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Coaxial cable charge density

  1. Sep 30, 2011 #1
    1. The problem statement, all variables and given/known data

    I have attached the question as a pdf.

    2. Relevant equations

    I'm thinking that we take the line integral of voltage to get electric field. But I'm not sure how to proceed from here. Is the line integral from a to b? Also, how do I get the charge density having found the electric field?

    Also, do I need to consider the dielectric in this part of the question?

    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Sep 30, 2011 #2

    rude man

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    Can you compute the capacitance per unit length between the inner & outer conductors?
     
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