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Shape of magnetic field

  1. May 6, 2008 #1
    i know how the magnetic field is shaped around a wire with current,
    and in the case of a solenoid,
    and in a bar magnet or U-magnet
    but that is the sum of all the magnetic fields of the charges moving through them.

    what i still don't know is the shape of the magnetic field surrounding a single moving particle, any comments to that ?
  2. jcsd
  3. May 6, 2008 #2
    Magnetic energy is not simply concentrated within coil windings, the existence of windings increases magnetic energy per current.

    The increased magnetism at windings is not due to higher electron velocity. Ion migration velocity is a function of volts, not bends versus straight wire.
  4. May 7, 2008 #3
    bad wording on my part maybe

    i mean that for a wire with a current the magnetic field can be described using lines of force/flux going around the wire in circles,
    in a solenoid the lines go through and to the other end,
    when speaking of magnets the lines go from the north pole to the south

    what i'm saying i still don't know how the lines would be like around a single moving particle
  5. May 7, 2008 #4


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    Staff: Mentor

    You can think of them as circles going around the path of the particle, with the magnitude of the field increasing as the particle approaches and decreasing as the particle recedes.
  6. May 10, 2008 #5
    What about the Meissner effect? Magnetism does not penetrate below the skin of a superconductor. In other words, the coil wires of a superconductive magnet are holes in a magnetic field.
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