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The surface current density, K, is defined as the the current through a unit width perpendicular to the flow. In particular:
K = v[itex]\cdot[/itex]σ
where σ is the surface charge density. Now I have a little trouble understanding this formula intuitively. Can someone describe in pictures how it is interpreted physically?
Also as a side note: Why can you unambigously speak of the current through a ribbon of width dl parallel to the current - what if the current changes as we move parallel to it?
K = v[itex]\cdot[/itex]σ
where σ is the surface charge density. Now I have a little trouble understanding this formula intuitively. Can someone describe in pictures how it is interpreted physically?
Also as a side note: Why can you unambigously speak of the current through a ribbon of width dl parallel to the current - what if the current changes as we move parallel to it?