Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Polarized sphere

  1. Jul 8, 2008 #1
    I am having difficulty with calculating field outside of a polarized sphere. It is a field of a dipole. What I get always stuck with is the calculation of the area charge density. I attach a picture. I need the distance of the speres surfaces to calculate the density from the volume charge density. Well I call the distance [tex]\Delta[/tex]R. And in every source I find that [tex]\Delta[/tex]R = cos[tex]\Theta[/tex] * l.
    But I have no ideat how to derive this. I tried some ways (the law of cosines for O O' A triangle) and I always got that this is just an approximation. However, none of the sources mention that it is an approximation.
    Can someone help?

    Attached Files:

  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?
Draft saved Draft deleted

Similar Discussions: Polarized sphere
  1. Polarization of wave (Replies: 1)

  2. Electron Polarization (Replies: 8)