Basic Electrical Theory
The group of magnetic field lines emitted outward from the north pole of a magnet is called
magnetic 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 108 magnetic field
If a magnetic flux (F) has 5,000 lines, find the number of webers.
1 x 108 lines/Wb
5 x 103
50 x 106 Wb
Magnetic Flux Density
Magnetic flux density is the amount of magnetic flux per unit area of a section, perpendicular to
the direction of flux. Equation (1-11) is the mathematical representation of magnetic flux
magnetic flux density in teslas (T)
magnetic flux in webers (Wb)
area in square meters (m2)
The result is that the SI unit for flux density is webers per square meter
. One weber per
square meter equals one tesla.