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Homework Help: Magnetic field

  1. Nov 20, 2012 #1
    1. The problem statement, all variables and given/known data

    Facts that facilitated this train of thought:
    -a magnet has a magnetic field that follows a route from the north to south pole.
    -no single pole magnet can exist, they must exist in pairs, implying that a magnetic field must always run from a N to a S pole.

    if a current carrying wire generates a magnetic field that continuously traces radially around the cylindrical wire, where would the N and S pole be? and why
  2. jcsd
  3. Nov 20, 2012 #2


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    Homework Helper

    Since the magnetic field around the wire is not produced by an actual magnet, why should there be a pole at all?
    For any small section of the field, we can work out where/how to pace some physical magnets, with their North and South poles, to create an equivalent local field.
  4. Nov 20, 2012 #3
    ok, i thought that a magnetic field implies the presence of magnetic poles. i guess a magnetic field implies there is either a magnet with poles, or a current. thank you
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