1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Finding potential difference in a very long hollow cylinder

  1. Mar 10, 2015 #1
    A very long hollow cylinder has inner radius A and outer radius B. It has a known unit charge per unit volume p. Find the difference in the electric potential a point on the axis and a point a distance A+D assuming A+D<B
    The diagram is in the url. It is #3


    I used Gauss law to find the Electric field at a point 'R'. I got pV/E0 then I integrated this from 0 to A+D and I got the answer p[A+D]^2/E0 though this isn't the answer. Could someone explain what I did wrong?
    The correct answer is -p/2E0 (4A^2/2 - A^2/2 - A^2ln2)
  2. jcsd
  3. Mar 10, 2015 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Please post your working to that point.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted