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Is my solution correct? (Electromagnetism problem)

  1. Apr 14, 2016 #1
    1. The problem statement, all variables and given/known data
    29lcoyq.jpg
    H1=10
    H2=-10
    B1=1.5
    B2=-1.5
    2. Relevant equations
    (change)Uloop = (change)H2*B2 + (change)H1*B1

    3. The attempt at a solution
    =(H1-H2)(B2-B1)
    =(10-(-10))(-1.5-1.5)
    =-60 j/m^3
     
  2. jcsd
  3. Apr 14, 2016 #2

    rude man

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    You're on the right track but you have computed the energy dissipated in 1 cycle (but with the wrong units). Now convert the energy per cycle to the time rate of energy dissipation.
     
  4. Apr 15, 2016 #3
    So, it sould be someting like ((H1-H2)(B2-B1))*f ?

    Where did I go wrong with units?
    Is it j/m^2 due to area (not volume)?
     
  5. Apr 15, 2016 #4

    rude man

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    Yes. A lot like! :-)
    You didn't go wrong. I did. The per-cycle energy dissipation units are J m-3 just as you said. Except the final answer is of course in J sec-1m-3.
     
  6. Apr 15, 2016 #5
    So, final answer sould be:
    =((H1-H2)(B2-B1))*f
    =-60 * 50
    =-3000 j sec^-1 m^-3
    Makes sense. Thanx for help :)
     
  7. Apr 15, 2016 #6

    rude man

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    OK, except no minus sign. Energy is dissipated in heat.
     
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