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Homework Help: Aluminum half rin

  1. Jul 9, 2007 #1
    1. The problem statement, all variables and given/known data
    My cousin James asked me for help on this question and I was stumped.
    There is an aluminum half ring thats inside radius is 1.8cm and outer radius is 2.3 cm. It has a thickness of 4.5mm and is at 20 degrees. The left side is at 47.5 microvolts and the right end is at 0 volts. I need to calculate the current density at radius r=2cm. The total current flowing. and the total resistance between the two ends of the half ring.

    2. Relevant equations
    mainly current density J=I/a

    3. The attempt at a solution

    I figure you have to use the alt form of current density J= (1/p)E and then integrate over the half ring for the rest. I am unsure though and any insight would be appreciated.
  2. jcsd
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