Electromagnetism
There is a fundamental relationship between electricity and magnetism; the movement of an electric charge will create a magnetic field around it, in a plane perpendicular to the direction of travel of the electric charge.
In a ferromagnetic material, the intensity of the magnetic field will be directly proportional to the current flowing through the material, up until the material is fully magnetised when it is said to be ‘saturated’.
Electrons that are moving in a current carrying conductor set up a magnetic field, the direction and orientation of which are given by the right hand rule if we assume the current flow, by convention, is opposite to electron flow; or the left hand rule if we assume the direction of current flow is the same direction as the electron flow. Modern accepted electrical theory states the current flows from negative to positive as with electron flow, i.e. electrons flow from negative potential to regions of positive potential.
