# Magnetic Flux Density

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#### Nikola Tesla

##### Nikola Tesla
Inventor, Electrical Engineer, Mechanical Engineer
July 9/10, 1856 - January 7, 1943
Often regarded as one of the most innovative and inventive individuals in the history of the sciences. He was the first to introduce the alternating-current machine, removing the need for commutator bars of dc machines. After emigrating to the United States in 1884, he sold a number of his patents on ac machines, transformers, and induction coils (including the Tesla coil as we know it today) to the Westinghouse Electric Company. Some say that his most important discovery was made at his laboratory in Colorado Springs, where in 1900 he discovered terrestrial stationary waves. The range of his discoveries and inventions is too extensive to list here but extends from lighting systems to polyphase power systems to a wireless world broadcasting system.
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#### 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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