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Homework Help: Differentiating electromagnetic field

  1. Feb 5, 2004 #1
    For question 3, i don't know ho to differentiate the electromagnetic field. Can someone help me?
     

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  3. Feb 5, 2004 #2
    correction

    It's question 2
     
  4. Feb 6, 2004 #3

    HallsofIvy

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    If F(x,y,z,t) the "total derivative of F is:
    [tex]\frac{\partial F}{\partial x}dx+\frac{\partial F}{\partial y}dy+\frac{\partial F}{\partial z}dz+\frac{\partial F}{\partial t}dt[/tex]
     
  5. Feb 6, 2004 #4
    help with #2 not #3

    I put the wrong question number down. It's #2 that I need help with. Can someone help?
     
  6. Feb 7, 2004 #5

    HallsofIvy

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    Odd. Your second post telling us that it is "problem 2 not problem 3" appears after my post but with an earlier "time stamp".

    In any case, I have already given the general formula for "total differential". You might also want to know that, for a vector valued function E, [tex]\frac{\partial(E.E)}{\partial x}= 2E.\frac{\partial E}{\partial x}[/tex]. That should be all you need.
     
    Last edited by a moderator: Feb 7, 2004
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