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Homework Help: 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


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    Science Advisor

    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


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    Homework Helper

    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.

  6. May 13, 2013 #5


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    Homework Helper

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

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