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Electric field in coaxial cable

  1. Jan 6, 2016 #1
    Every physics books show that wave prograpation in coxial cable is TEM wave, like in the picture. But we know that J=σ E from ohms law, which says current in same direction with E field, which is not the case here. What do you think the reason is ?

  2. jcsd
  3. Jan 6, 2016 #2


    Staff: Mentor

    Last edited: Jan 6, 2016
  4. Jan 15, 2016 #3
    Hello Dale,

    Thank you for the reply. But I am talking about the ideal case where the cable has infinite conductivity and progpagation is pure TEM wave, which makes it sure that there is no "longitudinal" (i.e Ez=0) along the cable by definition. In this case, what force acts on the charges to flow down the cable ?
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