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Simple Maxwell Equation question

  1. May 13, 2013 #1
    1. The problem statement, all variables and given/known data

    In the Maxwell eqn

    divD = ρ (sub f)

    What does ρ sub f represent?



    2. Relevant equations



    3. The attempt at a solution

    Does is represent volume density of charge?
     
  2. jcsd
  3. May 13, 2013 #2

    HallsofIvy

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    No, B is the magnetic field flux so [itex]\rho_f[/itex] is the "volume density of magnetism". Since there are no "magnetic monopoles", that should always be 0.
     
  4. May 13, 2013 #3
    Thanks very much HallsofIvy!
     
  5. May 13, 2013 #4

    ehild

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    D is the vector of electric displacement and its divergence is equal to the volume charge density. "f" can mean "free", the excess macroscopic charge density.
    http://scienceworld.wolfram.com/physics/D.html

    ehild
     
  6. May 13, 2013 #5

    ehild

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    HallsofIvy, the question was "D" not "B".

    ehild
     
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