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

Electromagnetics doubt

  1. Dec 14, 2013 #1
    Why j.ds has ' closed integral ' on below equation

  2. jcsd
  3. Dec 14, 2013 #2


    User Avatar
    Gold Member

  4. Dec 14, 2013 #3


    User Avatar
    Gold Member

    I think this is some kind of continuity equation.Its considering a region of space with some charge inside it.Because charge can't be created or destroyed,the only thing which can cause the amount of charge to change is a current and so we should have a surface integral of current density.But because we're interested in a region of space,the surface is the one enclosing that region which is of course closed.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Discussions: Electromagnetics doubt
  1. Patentability doubt (Replies: 5)

  2. Transistor doubts (Replies: 2)

  3. Doubts on SMPS (Replies: 3)

  4. Doubt in Circuits (Replies: 0)

  5. Opamp doubt (Replies: 12)