Flux Density, B, of a Cylindrical Magent

AI Thread Summary
The discussion centers on calculating the flux density (B) of a cylindrical magnet, specifically seeking the value of z, the distance from the pole face along the symmetrical axis. Participants clarify that z is a variable that can change, affecting the flux density, and suggest using an equation to calculate B at various distances. The original poster considers assuming a value for z but is unsure about the height of the flux field. It is confirmed that flux density does indeed change with distance z, and a different formula would be needed for calculating B at a horizontal distance from the magnet. Understanding these concepts is crucial for accurate calculations in magnetism.
Bri1
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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
 
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Bri1 said:
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?View attachment 113520
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?
 
berkeman said:
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?

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 shouldn't change with respect to z not so?
 
Bri1 said:
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 shouldn't change with respect to z not so?
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.
 
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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