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!

Calculating resistance between two bolts connected to a metal plate

  1. Oct 25, 2008 #1
    1. The problem statement, all variables and given/known data

    Given is a metal plate with two metal bolts attached to it, the attachement is assumed to be idealy conducting. A current I flows between the two bolts. Find a general formula for the Resistance between the two bolts (depending upon: a) the thickness of the plate (delta) b) the radius of the Bolt (r) c) the distance between the center-points of both bolts (l) d) and the specific conductivity of the metal that the plate is made of (kappa))

    Here is what it looks like:

    ___________________________________
    |aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa|
    |aaaaaaaaaaaaaaaaaal aaaaaaaaaaaaaaa|
    |aaaaaa<----------------------->aaaaaa|
    |aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa|
    |aaaaaaOaaaaaaaaaaaaaaaaaaaaaOaaaa|
    |aaaaa<>aaaaaaaaaaaaaaaaaaaaa<>aaa|
    | aaaaa2r aaaaaaaaaaaaaaaaaaa2raaaaa|
    |aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa|
    |__________________________________|

    Edit: ignore the white a's. i tried making them spaces, but the BB removed the spaces

    2. Relevant equations

    Here is the answer, but how do you get there:

    R = ln( 2(l-r)/ (2r) )/( pi * kappa * delta)

    3. The attempt at a solution

    the ln() must come from integrating one over circumference: 1/( r * 2 * pi) from (2r) to (2(l-r)) but why?



    Thanks
     
    Last edited: Oct 25, 2008
  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?



Similar Discussions: Calculating resistance between two bolts connected to a metal plate
Loading...