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

  1. Jun 21, 2017 #1
    Hi,

    I have a problem with the fomular
    u=m·B
    and
    u=B^2/4pi
    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

    vanhees71

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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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