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Magnetic-field energy question

  1. Mar 30, 2015 #1
    1. The problem statement, all variables and given/known data
    What is the magnetic-field energy in a 10.0cm3 volume of space where B = 3.50T?

    2. Relevant equations
    u = B2/2μ0

    3. The attempt at a solution
    Using the equation I got an answer of 4.87*105 J/m3 which is incorrect
     
  2. jcsd
  3. Mar 30, 2015 #2

    phyzguy

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    It doesn't ask for the energy density, which is what you gave. It asks for the energy, so your final answer should be in Joules, not Joules/m^3.
     
  4. Mar 30, 2015 #3
    Should an answer using that formula along with those units be correct, though? I only have 2 more submissions available.
     
  5. Mar 30, 2015 #4

    phyzguy

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    Yes, you're on the right track. You have calculated the energy density almost correctly. I got 4.87*106 J/m3, so one of us made a mistake. Then how do you go from energy density to energy?
     
  6. Mar 30, 2015 #5
    Oh I see now. I should multiply by the volume of the space correct?
     
  7. Mar 30, 2015 #6

    phyzguy

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