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Electromagnetics doubt

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

  2. jcsd
  3. Dec 14, 2013 #2


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  4. Dec 14, 2013 #3


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    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.
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