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,
$$1 \,T = 1 \, Wb/m^2$$
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