ABSTRACT
This chapter discusses the fundamental law of magnetism and explains the term 'magnetic field'. In magnetised ferromagnetic materials, however the domains are arranged in 'rows' – leaving columns of unattached north poles at one end of the material, and columns of unattached south poles at the opposite end. In order to make an unmagnetised ferromagnetic material into a magnet, its domains must be realigned to form rows. A compass needle lies along the earth's natural lines of magnetic flux, which link Magnetic North and Magnetic South, and does not indicate True North and True South. The chapter also explains the difference between permanent and temporary magnets and describes the direction allocated to magnetic flux. The intensity of the lines of flux is an indication of the strength of a magnet.
