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!

Momentum of electromagnetic fields

  1. Aug 3, 2006 #1
    I am having a little trouble with this. To attack this problem (I reckon anyway) is to recognise that the current density vector J(x) can be written it terms of the number density and the velocity. But I'm not sure how to incorporate the Taylor expansion with the cross product. If somebody could give me a few hints just to get me started again that would be great!



    Attached Files:

    • q2.doc
      File size:
      19.5 KB
    Last edited: Aug 3, 2006
  2. jcsd
  3. Aug 4, 2006 #2

    Meir Achuz

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    You have to:
    1. Expand J in a 3D Taylor expansion.
    2. Integrate by parts to get from phi to E.
    3. Go from \int xj to m by writing xj as a sum of sym and asym parts.
    This is easiest using dyadics.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Momentum of electromagnetic fields
  1. Electromagnetic field (Replies: 4)