In a large electromagnet, the poles have a circular cross section with a diameter of 100mm and are 25mm apart. If there is a uniform 1.3T magnetic field between the poles, how much magnetic potential energy is stored in the magnetic field?

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anonymous · Answer

@Michele_Laino @IrishBoy123 @dan815 @ybarrap

ybarrap · Answer

You should be able to use this formula - http://hyperphysics.phy-astr.gsu.edu/hbase/electric/engfie.html $$ \eta_B=\cfrac{B^2}{2\mu_o}\cfrac{\text{J}}{\text{m}^3} $$ Then $\eta_B\times \text{volume}$ will give you the total magnetic energy in the field. This formula can be used to find the energy in an inductor but also could be used to find the energy in any volume: |dw:1446435323914:dw|

ybarrap · Answer

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