Magnetic Flux Density

What is Magnetic Flux Density?

The magnetic flux density or magnetic field strength is the number of magnetic lines of force passing through a unit area of material.
It is denoted by the capital letter B, and is measured in tesla. Its magnitude is determined by the following equation: $$ B = {\Phi \over A}$$ where $\Phi$ is the number of flux lines passing through the area A.
By definition, $$1 \,T = 1 \, Wb/m^2$$