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Resistance of a disk

  • Thread starter Gyroscope
  • Start date
  • #1
Gyroscope

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

 

Answers and Replies

  • #2
berkeman
Mentor
56,817
6,786
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
Gyroscope
It's the sum of the resistances of each ring of the disk.
 

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