Domain wall motion is the reorientation of the magnetic domains when a ferromagnetic material is removed from an externally applied magnetic field. 

Applying an external magnetic field to a ferromagnetic material can cause it to become a permanent magnet.

A coil wrapped around a ferromagnetic core will experience the same flux density as a coil wrapped around a torus filled with air, only if the current passing through the coils are the same.

Ferromagnetic materials have magnetic domains consisting of magnetic moments in one direction.

The right-hand grip rule

Ampere's Circuital Law

Lenz's Law

Faraday's Law

Complete saturation is the point when there is an exact proportional increase in material's flux density as the field intensity is increased.

The BH curve is usually approximated as two linear regions.

The slope of the saturation region is equal to the permeability of free space.

The field can be represented by straight lines emanating from the conductor in a all directions.

The relationship between the current and the magnetic field can be expressed by the right-hand grip rule.

The direction of the magnetic field is tangential to a circle centered on the conductor and lying in a plane normal to its center line.

The direction of the magnetic field is parallel to the flow of current through the conductor

The direction of the magnetic field is tangential to a circle centered on the conductor and lying in a plane parallel to its center line.