Permanent magnets are assigned by choosing a permanent magnet material for a solid.
These materials are defined by the Magnetization Direction vector,
and a demagnetization curve. The Magnetization Direction vector
direction indicates the direction of the magnetization relative to the global world
coordinate system. The magnitude of the vector is ignored. The demagnetization curve is
defined using comma-delimited lists: one for the magnetic induction (parameter labeled
Demagnetization Curve B (T)) and the other for the corresponding
magnetic field (parameter labeled Demagnetization Curve H (A/m) ).
At a minimum, two points should be specified: for *B* the two points
are *Br* and zero, in that order, where *Br* is the
residual induction or remanence, and for *H* the two points are zero
and *Hc*, where *Hc* is the coercive force. The
image below shows this simplest case, where *B* and
*H* are each defined with two points. A more detailed curve can be
specified by adding more points to these lists.

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