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Homework Help: Oddity in using maxwell's equations in time independent form

  1. Nov 11, 2013 #1


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    I am solving a question that asks me to find an H field in phasor form from the given E field in phasor form

    Es = j30(beta)(I)(dl)sin(theta)e^(-j(beta)r) a(theta) V/m

    Given that the EM wave propagates in free space.

    Why do I get different answers if I :

    1) Divide Es by the magnitude of the intrinsic impedance of free space

    2) Solve for H field using maxwells equations in phasor form

    Should be the same answer right? Since intrinsic impedance is derived using maxwell's equations in my textbook.

    any help thanks
  2. jcsd
  3. Nov 11, 2013 #2


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    I am now assuming it is because not only is the wave time varying, it is also propagating.

    That leads to the treatment of the field as a wave, and THAT leads to the definition of intrinsic impedance?
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