Basic Electrical Theory MAGNETISMMagneticFluxThe group of magnetic field lines emitted outward from the north pole of a magnet is calledmagnetic flux. The symbol for magnetic flux is F (phi).The SI unit of magnetic flux is the weber (Wb). One weber is equal to 1 x 108magnetic fieldlines.Example: If a magnetic flux (F) has 5,000 lines, find the number of webers.F5000 lines1 x 108 lines/Wb5 x 10310850 x 106Wb50 µWbMagneticFluxDensityMagnetic flux density is the amount of magnetic flux per unit area of a section, perpendicular tothe direction of flux. Equation (1-11) is the mathematical representation of magnetic fluxdensity.(1-11)BFAwhereB = magnetic flux density in teslas (T)F= magnetic flux in webers (Wb)A = area in square meters (m2)The result is that the SI unit for flux density is webers per square meter . One weber perWbm2square meter equals one tesla.Rev. 0 Page 29 ES-01
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