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Homework Help: Electric potential along the axis of a cylindric tube

  1. Jan 29, 2009 #1
    1. The problem statement, all variables and given/known data
    Imagine a cylinder of radius R and Length L. Both of it's ends are open and it carries a uniform surface charge desnity of sigma (@) Find the electric potential at any point along the axis of the cylinder, and then use that to calculate the electric field at any point.

    2. Relevant equations

    3. The attempt at a solution
    Essentially the way you are supposed to do this problem (I think) is to assume the tube is just a bunch of stacked line charges (rings), and then find the potential from a ring, and then integrate from 0 to L or something, I'm having real trouble doing so however, any help out there?
  2. jcsd
  3. Jan 30, 2009 #2
    Your concept is correct. Find dE for a ring line of charge and keep in mind dE has only an axial component due to symmetry. Try setting up the intergral and post it.
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