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Out of phase EM Wave

  1. Dec 29, 2015 #1
    Why can't we have an Electromagnetic wave in which the Electric Field and Magentic Field aren't in phase?
     
  2. jcsd
  3. Dec 29, 2015 #2

    jasonRF

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    You can - it depends on the medium in which the wave is propagating. In free space or an idealized loss-less dielectric they are in phase. Once you add a little loss in the dielectric (as all real dielectrics have) then the fields are no longer exactly in phase. In a good conductor the electric and magnetic fields are 45 degrees out of phase.

    jason
     
  4. Dec 31, 2015 #3

    tech99

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    Is the 45 degrees for a wave propagating inside the conductor? Thank you.
     
    Last edited by a moderator: Dec 31, 2015
  5. Dec 31, 2015 #4

    jasonRF

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    Yes.
     
    Last edited by a moderator: Dec 31, 2015
  6. Jan 7, 2016 #5
    Is there an analytical solution to show that E and M fields in a perfect conductor are out of phase by 45 degrees? (I can handle the calculus.)
     
  7. Jan 7, 2016 #6

    jasonRF

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