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On a basic level why can't monopoles exist?

  1. Aug 17, 2014 #1
    1. The problem statement, all variables and given/known data

    If a positive electric charge can create a magnetic field (because all you need to create a magnetic field is a moving charge), how is there 2 poles in this magnetic field created by this positive electric charge. Why isn't the magnetic field created by a single positive electric charge considered a monopole?
     
  2. jcsd
  3. Aug 17, 2014 #2

    BvU

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    Are we mixing up things ? In your description, where exactly do you locate the 2 poles you mention ?
     
  4. Aug 17, 2014 #3

    BvU

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    Other approach: if there were magnetic monopoles, there would be magnetic field lines coming out of e.g. a sphere surrounding such a thingy -- without magnetic field lines going in. But the magnetic field lines from a moving charge are neat circles, all of them. No beginning, no end.

    The sophisticated way to express this is ##\nabla\cdot{\bf \vec B}=0##, one of the Maxwell equations
     
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