Electromagnetics doubt

  • Thread starter bhanesh
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  • #1
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Why j.ds has ' closed integral ' on below equation

1387035907054.jpg
 

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  • #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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