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Energy density of Electric and Magnetic Fields

  1. Oct 9, 2012 #1
    I know that energy density of Electric and Magnetic Fields are

    (ε/2)*E2 and [1/(2μ)]B2 respectively.

    But I can't understand how we get those expressions. Would be really happy if you could clear my problem.

    Thanks a lot
  2. jcsd
  3. Oct 9, 2012 #2


    User Avatar

    Staff: Mentor

  4. Oct 10, 2012 #3
    You can derive the expressions from a flat capacitor and from a solenoid, for instance.
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