Electro-Magnetic Induction © D Hoult 2008

Magnetic flux

If the magnitude of the flux density is B then the magnitude of the magnetic flux (f) linked with the area A is defined to be

If the magnitude of the flux density is B then the magnitude of the magnetic flux (f) linked with the area A is defined to be f = A B

f = A B units of flux

f = A B units of flux T m2

f = A B units of flux T m2 1 T m2 = 1 Weber (Wb)

Now, the magnitude of the component of the flux density perpendicular to the area is B cos q

so the magnetic flux (f) linked with the area is now Now, the magnitude of the component of the flux density perpendicular to the area is B cos q so the magnetic flux (f) linked with the area is now f = A B cos q alternatively

In practice, the area in question is usually surrounded by a conductor, often a coil of wire.

In practice, the area in question is usually surrounded by a conductor, often a coil of wire. If the coil of wire has N turns, we define the flux linkage as follows

In practice, the area in question is usually surrounded by a conductor, often a coil of wire. If the coil of wire has N turns, we define the flux linkage as follows Flux linkage = N f