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Flux Density, B, of a Cylindrical Magent

  1. Feb 21, 2017 #1
    Hi, I'm trying to calculate the flux density of a magnet, I can get all but one of the values needed to calculate it. Does anyone know how/where to get the z(distance from a pole face on the symmetrical axis) value? Screen Shot 2017-02-21 at 12.33.07 PM.png
     
  2. jcsd
  3. Feb 21, 2017 #2

    berkeman

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    Staff: Mentor

    Welcome to the PF.

    z is just a variable. It looks like you have an equation there which would work along the z axis for varying distances, no?

    BTW, is this for schoolwork or a hobby project?
     
  4. Feb 21, 2017 #3
    Thanks for responding, It's for school but it feels more like a hobby, I was thinking of just assuming a value for z. I'm studying mechanical engineering so electrical isn't my strong point. But I believe it might be a set value, maybe a distance from the pole face to the height of the flux field? but then I don't know the height of the flux field anyway

    My reason for thinking its a set value is because the flux density of the magnet shouldnt change with respect to z not so?
     
  5. Feb 21, 2017 #4

    berkeman

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    Staff: Mentor

    No, it definitely changes with distance z. It looks like this:

    http://www.4physics.com/phy_demo/NewtonsNightmare/ShortBarMagnetBField.gif
    ShortBarMagnetBField.gif
    So yes, just use the equation to calculate the flux density at some distance z away from the pole face.
     
  6. Feb 21, 2017 #5
    Oh okay thanks!!

    but what if the distance I wanted to calculate B for is horizontally across from the magnet instead of vertically away from it? A different formula?
     
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