Physics Help Forum Magnetic flux density and susceptibility

 Sep 13th 2017, 10:42 PM #1 Junior Member   Join Date: Sep 2017 Posts: 1 Magnetic flux density and susceptibility What is the relation between magnetic suscptibility and magnetic flux density. How can I know how much gauss I will need to attarct a mineral/oxide of given magnetic suscptibilty ?
Sep 14th 2017, 09:07 AM   #2
Physics Team

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Magnetic flux density == Magnetic Field

I thought that I should point out that the terms Magnetic flux density and Magnetic Field a synonymous. The later is more widely used.

 What is the relation between magnetic suscptibility and magnetic flux density.
There is no such relationship. Magnetic susceptibility (which I'll label X) is the quantity which is defined through what's called a constitutive relation which relates the magnetic field in a material to the magnetization vector at the same point in material. For simple magnetic materials the relation is

M = XH

where

M = Magnetization

H = Magnetic field

 How can I know how much gauss I will need to attarct a mineral/oxide of given magnetic suscptibilty ?
It will always be attracted regardless of the field strength. What the force is will be a different story

To know the force you need to state the nature of the material, i.e. volume, shape etc.

Last edited by Pmb; Sep 14th 2017 at 09:30 AM.

 Sep 15th 2017, 11:04 AM #3 Senior Member     Join Date: Jun 2016 Location: England Posts: 376 I think what you are after (which is not exactly what you asked) is: How can you work out the strength of Magnet required to move some objects, given that you know the Magnetic susceptibility of the material the objects are made from. As Pmb points out any resultant motion will depend on the objects size (etc.) at least as much as it will on the Magnetic susceptibility of the material it is made from. __________________ ~\o/~

 Tags density, flux, magnetic, susceptibility

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