Resistance of a disk

  • #1


Homework Statement

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:

Homework Equations

The Attempt at a Solution

  • #2
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?
  • #3
It's the sum of the resistances of each ring of the disk.