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What is Magnetic Flux Density?

Nikola Tesla

Magnetic flux density is the amount of magnetic flux per unit area of a section that is perpendicular to the direction of flux. It is also sometimes known as "magnetic induction" or simply "magnetic field". It can be thought of as the density of the magnetic field lines - the closer they are together, the higher the magnetic flux density.

Mathematically it is represented as B = Φ/A where B is magnetic flux density in teslas (T), Φ is magnetic flux in webers (Wb), and A is area in square meters (m2). The SI unit for magnetic flux density is the tesla which is equivalent to webers per square meter. The unit was named in 1960 after the Serbian-American electrical engineer Nikola Tesla.

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