Which term refers to the amount of magnetic flux per unit area?

The correct term for the amount of magnetic flux per unit area is magnetic flux density. This concept arises from the relationship between magnetic flux, which is the total magnetic field passing through a given area, and the area itself. Magnetic flux density quantifies this relationship by describing how concentrated the magnetic field lines are in a specific area. It is measured in teslas (T) in the SI unit system, providing a clear indication of the field strength in a designated space.

If we consider the other terms, magnetic field strength refers to the intensity of the magnetic field at a point in space, but it does not specifically account for the area through which the flux is passing. Magnetic susceptibility describes how much a material will become magnetized in response to an applied magnetic field. Magnetic permeability is a measure of how easily a material can support the formation of a magnetic field within itself, influencing how a magnetic field interacts with a substance. While all these terms are related to magnetism, magnetic flux density is the precise measure of magnetic flux per unit area.