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: V of 2 parallel lines makes cylinders

  1. Sep 16, 2013 #1
    1. The problem statement, all variables and given/known data
    Expanded from Griffith's (3rd ed) #2.47

    Infinitely long wires parallel to x axis carrying ±λ charge densities intersect the y-axis at ±a.

    A) Calculate V(x,y,z) if V(0,0,0)=0
    B)Show that the equipotential surfaces are circular
    cylinders. Locate the axis and calculate the
    radius of the cylinder that is at potential V0.

    2. Relevant equations
    Gauss, -∫Edl

    3. The attempt at a solution

    I've found the solution to part A easily enough but I'm not sure how to approach B. I know that at the origin the potential is zero along the x axis but I'm confused by how I should show that these are both circular cylinders.

    I'd post my solution for A but it's exactly the same as the solution manual so it's easy enough to find.

    Any help would be appreciated.
  2. jcsd
  3. Sep 16, 2013 #2
    Why not look at your solutions manual. . .
  4. Sep 16, 2013 #3
    The part b is not part of the original question. Thus, not in the manual.
  5. Sep 17, 2013 #4
    hmm, never mind I guess it was in the manual. Sorry thought that he just added it. thanks anyway.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted