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Homework Help: Electric and magnetic energy densities of the earth

  1. Aug 5, 2012 #1
    1. The problem statement, all variables and given/known data

    What are the units for electric energy density and magnetic energy density? Is it J/m^3

    2. Relevant equations

    μ(mag)= (B2)/ (2μo)

    μ(electric) = (1/2) (εo) (E2)

    3. The attempt at a solution

    Magnetic energy density : T2/ N/A2 = J/m^3
    electric energy density : C2/ Nm2 x N/C
  2. jcsd
  3. Aug 5, 2012 #2

    Simon Bridge

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    Science Advisor
    Homework Helper

    Start with the definition of "energy density".
    Write the units for that definition.

    You can show that the magnetic and electric energy density expressions lead to equivalent units by doing the dimensional analysis.
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