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superconducting wire questions

Discussion in 'Misc Electronics' started by Ken Williams, Feb 6, 2009.

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  1. Ken Williams

    Ken Williams Guest

    If I have a normal copper wire and I run electricity through it a
    magnetic field is produced around the wire.

    1) If the wire is super conducting there should be no magnetic field

    2) Is the magnetic field produced in a copper wire proportional to the
    wire's resistance somehow?
  2. Charles

    Charles Guest

    Super conductors are used in accelerators and they have an awesome magnetic
    field. Resistance limits current flow which limits the field intensity.
  3. Sjouke Burry

    Sjouke Burry Guest

  4. Bob Myers

    Bob Myers Guest

    No and no. The magnetic field surrounding a conductor -
    or even that due to a stream of electrons in free space - is
    proportional to the current, which simply put is the amount of
    charge "flowing" past a given point per unit time. In other
    words, the magnetic field is proportional to the rate at which
    charge is being transferred along a given path.

    A superconducting wire carrying, say, 1A of current would
    have exactly the same field surrounding it as a conventional
    conductor carrying the same current. What it would lack,
    due to the lack of resistance in the conductor, is a *voltage*
    drop from end to end.

    Bob M.
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