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I Magnetic Energy of solenoid( u=m·B or u=B^2/4pi )

  1. Jun 21, 2017 #1

    I have a problem with the fomular
    Since I want to calculate how many magnetic energy on a solenoid, I couldn't decide which fomular should I use.
  2. jcsd
  3. Jun 21, 2017 #2


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    In Gaussian units the electromagnetic field-energy density is given by
    $$u=\frac{1}{8 \pi} (\vec{E}^2+\vec{B}^2).$$
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