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Phasor form of an E field

  1. Dec 8, 2013 #1
    If I am given an E field E = uniti Asin[w(t-z/c)+pi/4].
    Is the phasor form = unit i Aexp(j pi/4) or unit i Aexp(-j(wz/c - pi/4) ?
     
  2. jcsd
  3. Dec 8, 2013 #2

    rude man

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    The phasor of a function (wave) containing variables other than time, in this case distance z, is I believe represented by a function including z but not t.

    So the phasor of A cos(wt - kz) would be A exp(-jkz) as the time function is Re{A exp j(wt - kz)}. The exp(jwt) is left out of the phasor expression since in any equation using phasors that term cancels out. At least that's been my experience with e-m wave phasors.

    So if the time function is A sin(wt - kz + θ), what do you think the phasor is?
    Hint: change your time function to read A cos(wt - kz + ψ).
     
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