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Homework Help: Criteria for propagation of EM wave

  1. Sep 13, 2008 #1
    1. The problem statement, all variables and given/known data
    When an EM wave propagates, the E and M field at a point are perpendicular. If E and M at a point are NOT perpendicular to each other, can it be that an EM wave is passing through that point?

    2. Relevant equations

    3. The attempt at a solution
    Consider a linearly polarized light travelling. If I create a constant electric field(by using a device, for example a "saturated" capacitor), the light won't vanish as the energy won't be conserved.
    So an EM wave MAY be propagating. I don't know if this is correct.
  2. jcsd
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