Talk:Magnetization

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[edit] Permeability

Putting Corsan and Loraine in relative units, I would write that

$\mathbf{B} = \mu_0\mu(\mathbf{H + M})$

or do you mean that $μ 0$ is the permeability? David R. Ingham 01:45, 26 August 2006 (UTC)

The equation above is not correct: $μ$ should not be in the equation. In SI units this equation should read

$\mathbf{B} = \mu_0\mu_r\mathbf{H} = \mu_0(\mathbf{H + M})$ .

Here $μ 0$ is the permeability of the vacuum ( $μ 0 = 4π10 - 7$ H/m) and $μ r$ is the relative permeability of the material. Assuming that

$\mathbf{M} = \chi_r \mathbf{H}$

which is correct for most materials in the world (not valid for ferromagnets) we obtain that

$\mathbf{B} = \mu_0\mu_r(\mathbf{H + \chi_r \mathbf{H}}) = \mu_0 (1+\chi_r)\mathbf{H}$

thus $μ r = 1 + χ r$ . In this equation $χ r$ is called the relative susceptibility.

TomyDuby 12:13, 29 December 2006 (UTC)

I think this should be:

$\mathbf{B} = \mu_0(\mathbf{H + \chi_r \mathbf{H}}) = \mu_0 (1+\chi_r)\mathbf{H}$

84.67.65.165 (talk) 16:24, 25 April 2008 (UTC)