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Electrical field lines in conductive wire

  1. May 12, 2009 #1

    we connect a Voltage to heads of a conductive wire
    how will be the field lines inside Wire ? (cylinder wire)

    E = [tex]\rho[/tex] J

    so ? :D

    field lines are parrarell inside wire ?

    in whole wire Electrical field is constant ?
    (J must be more in center of wire)

    what about Extreme Conductors ? ( i dont know the word in Eng , those with 0 Resistance)
    Last edited: May 12, 2009
  2. jcsd
  3. May 19, 2009 #2
    If the current is constant it is a good approximation to assume, that the current and the electric field are the same everywhere and in parallel to the wire. Superconductors have currents only running on the surface, and there cannot be an electrical or magnetical field deep inside.
  4. May 19, 2009 #3
    Seven-conductor wire (6 + 1 conductors) is a good compact design. For dc currents, the current is the same in every wire. The electric field lines are uniform and parallel to the wires, and are due to the wire resistance (div D = p). At high ac frequencies the currents flow in a thin layer (skin depth) on the outside of the wires.
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