1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Electric Field in Coaxial Cable

  1. Jun 24, 2007 #1
    1. The problem statement, all variables and given/known data
    a=radius of inner electrode = 0.05 cm
    b=radius of outer electrode = 0.5 cm
    Vo = 130 V

    QUESTION: What is the electric field at surface of the inner electrode in units of V/m?
    2. Relevant equations
    Given equations
    Potential at radius r b/w inner&outer electrodes is
    V=Vo*ln(r/a) (Eq 1)

    Elect field at r is
    E(V/m) = (1/r)*[V/ln(b/a)] Eq (2)

    3. The attempt at a solution

    First in finding the V at surface of inner electrode,
    the value of r is same as a because it's at surface, so the ln (r/a) term
    becomes zero. So that is where I am stuck. Are the equations I am given correct?
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you help with the solution or looking for help too?