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How do you calculate the Force of Attraction of two magnets?

  1. Aug 10, 2017 #1
    I just took physics 2. We learned how to calculate the force of a magnetic field on a current or moving charges. What we didn't learn is how to calculate the force of attraction of two bar magnets or electromagnets for that matter. I'm building a coilgun and having a set of equations for this would come in really handy.
     
  2. jcsd
  3. Aug 10, 2017 #2

    DrDu

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    You could imagine the bar magnet to be made up of small magnetic dipoles, i.e. the magnetization M is the dipole moment density. So you could derive first the magnetic moment of a dipole and the force it experiences in a homogeneous magnetic field (e.g. you can model it as an arbitrary small current loop) and then you can obtain the force between extended magnets integrating over the magnetizations.
     
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