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Homework Help: Resistance of a disk

  1. Apr 3, 2007 #1
    1. The problem statement, all variables and given/known data
    A disk with width b and radius a.
    An element of resistance is:

    [tex]dR=\rho \frac{2\pi r}{bdr}[/tex]

    How do I integrate this?

    Thanks in advance. :approve:

    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 3, 2007 #2

    berkeman

    User Avatar

    Staff: Mentor

    I don't understand your volume element. You are trying to get the total resistance between what two places? A point on one edge of the disk to a point on the other side, or from the center out to the perimiter, or what?
     
  4. Apr 3, 2007 #3
    It's the sum of the resistances of each ring of the disk.
     
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