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Magnitude of electric field/Need answer checked

  1. Feb 21, 2016 #1
    1. The problem statement, all variables and given/known data
    A long coaxial cable consists of an inner cylindrical conductor with radius a and an outer coaxial cylinder with inner radius band outer radius c. The outer cylinder is mounted on insulating supports and has no net charge. The inner cylinder has a uniform positive charge per unit length λ.
    Calculate the magnitude of the electric field at any point between the cylinders a distance r from the axis.
    Express your answer in terms of the variables a, b, c, r, λ and constants π and ϵ0.

    2. Relevant equations
    E=(1/4πϵ0)(q/r^2)
    q= λ2πr
    3. The attempt at a solution
    Using the equation above I got (E= λ/2ϵ0r). I just want to make sure that I'm not missing anything. I only have one attempt left at answering the question.
     
  2. jcsd
  3. Feb 22, 2016 #2

    BvU

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    How did your relevant equations help you in the solution phase ? I see a lot of the problem variables not appearing in there. Please show your steps in part 3.
     
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