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Resistance of the insulation in coaxial cable

  1. Nov 12, 2013 #1
    1. The problem statement, all variables and given/known data
    Determine the resistance of the insulation in a length l of coaxial cable.inner radius = a and outer radius= b.


    2. Relevant equations

    R=[itex]\rho[/itex][itex]\frac{l}{A}[/itex]
    Area= [itex]\pi[/itex] [itex] (b^2 - a^2) [/itex]

    3. The attempt at a solution
    I calculated the area between the two concentric 'circle' with radius 'a' and 'b'.

    Then I calculated R using the formula.

    However I am not sure whether it is correct approach or not
     
    Last edited: Nov 12, 2013
  2. jcsd
  3. Nov 12, 2013 #2

    berkeman

    User Avatar

    Staff: Mentor

    I believe you will need to do an integration instead. The value of A is changing with radius...
     
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