Physical meaning of parts of electromagnetic wave

  1. in

    E = E_0exp i(k dot r - wt) or E = cos(k dot r - wt)

    what does k dot r physically represent? Can r be any position in space or must it lie on the wave?

    (I physically understand what a dot product is)
     
  2. jcsd
  3. That's a plane wave, it occupies all of space.

    If you want a beam that is localized along a line, E_0 has to be a function of distance from the line.
     
  4. jtbell

    Staff: Mentor

    Yes.

    A 3-dimensional plane wave fills space. It doesn't lie "along" a line or other single path. See the diagram and associated instructions in the following post for a more realistic picture of a plane electromagnetic wave than you see in many textbooks.

    https://www.physicsforums.com/showpost.php?p=533190&postcount=6
     
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