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Homework Help: How do I calculate Volts per cm (V/cm) with the following given?

  1. Sep 19, 2009 #1
    1. The problem statement, all variables and given/known data

    How do I calculate Volts per cm (V/cm) with the following given?
    Two coaxial tubes with 20kV placed across them.
    Inner tube (actutally solid rod) has an OD of .5" and a length of 4"
    Outer tube has an OD of 1.00" and a length of 4"

    2. Relevant equations

    3. The attempt at a solution
    I was going to calculate the Area of the inner and outer tubes and convert them to cm, then divide the total area by the applied voltage? Somehow I don't think that is right???
  2. jcsd
  3. Sep 19, 2009 #2


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    Staff: Mentor

    I'm not understanding the problem statement. Why would you have two coax cables with a net voltage between them. Usually the shields of each coax will be at ground potential, or somebody is about to lose their job...
  4. Sep 19, 2009 #3
    They are just coaxial tubes (one inside the other) which form a capacitor. Sorry if I explained that wrong.
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