magnetic_flux_field#

astropy.units.magnetic_flux_field(mu_r=1)[source]#

Convert magnetic field between magnetic field strength \((\mathbf{H})\) and magnetic flux density \((\mathbf{B})\) using the relationship:

\[\mathbf{B} = \mu_r \mu_0 \mathbf{H}\]
where:

  • \(\mu_0\) is the vacuum permeability, a physical constant.

  • \(\mu_r\) is the relative permeability of the medium, a dimensionless quantity.

The default setting (\(\mu_r=1\)) represents conditions in a vacuum.

Parameters:
mu_rfloat, optional

The relative magnetic permeability of the medium. This is a dimensionless quantity and has a default value of \(\mu_r=1\) which corresponds to free space (vacuum).

Examples

>>> import astropy.units as u
>>> H = 1 * u.Oe
>>> H.to(u.G, equivalencies=u.magnetic_flux_field())
<Quantity 1. G>
>>> H.to(u.G, equivalencies=u.magnetic_flux_field(mu_r=0.8))
<Quantity 0.8 G>
>>> B = 1 * u.T
>>> B.to(u.A / u.m, equivalencies=u.magnetic_flux_field())
<Quantity 795774.71502628 A / m>
>>> B.to(u.A / u.m, equivalencies=u.magnetic_flux_field(mu_r=0.8))
<Quantity 994718.39378285 A / m>