ABSTRACT
To understand the phenomenon of magnetism we must also consider electricity and vice versa. A stationary
electric charge produces, at a point a fixed distance from the charge, a static (i.e., time-invariant) electric field.
A moving electric charge, i.e., a current, produces at the same point a time-dependent electric field and a
magnetic field, dH, whose magnitude is constant if the electric current, I, represented by the moving electric
charge, is constant.
