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Whenever electrons flow through a conductor a magnetic field will develop around it and this effect is called electromagnetism. The magnetic field affects the alignment of electrons within atoms causing a physical force to exist between atoms and can affect matter at a distance, through empty space. The magnetic field can be measured in two ways: its force or the strength it has over a certain distance (symbol mmf and units Amp-turns) and its flux which is the total quantity of the field in space (symbol Φ and units Webers). The amount of field flux that will develop in space is proportional to the amount of field force applied.