The Magnitude of Magnetism
We now know that the lines of force or more commonly the magnetic flux around a magnetic material is given the Greek symbol, Phi, ( Φ ) with the unit of flux being the Weber, ( Wb ) after Wilhelm Eduard Weber. But the number of lines of force within a given unit area is called the “Flux Density” and since flux ( Φ ) is measured in ( Wb ) and area ( A ) in metres squared, ( m2 ), flux density is therefore measured in Webers/Metre2 or ( Wb/m2 ) and is given the symbol B.
However, when referring to flux density in magnetism, flux density is given the unit of the Tesla after Nikola Tesla so therefore one Wb/m2 is equal to one Tesla, 1Wb/m2 = 1T. Flux density is proportional to the lines of force and inversely proportional to area so we can define Flux Density as: