If B is at 90° to the area, A, then the total magnetic flux, "passing through" A is defined to be

The units of flux are Tm² and 1 Tm² = 1 Weber

If B is not at 90° to the area:

the component of B which acts at 90° to A is Bcos a. So, in this case, the flux "passing through" the area is defined to be

If a flux, f, "passes through" a coil of N turns then the coil is said to be linked to the flux (or threaded by the flux) and we define the quantity "flux linkage" as

• Electricity and Magnetism Chapters Index
• Return to top of page