Magnetic Flux Density (B)

The magnetic flux density is the product of field intensity and the permeability of the medium. The SI unit of magnetic flux density is the tesla or weber per square metre.

Magnetic Flux Density
under high current transmission lines20µT
natural magnetic field of Earth30 to 70µT
toy magnets, magnetic clips0.5mT
acute exposure limit for general public400mT
MRI scanning0.15 to 3T
head and trunk recommended ocupational exposure limit2T
maximum exposure limit with restricted movement induced effects8T
medical research MRI scanningup to 10T


"Guidelines on limits of exposure to static magnetic fields", Health Physics 96(4):504-514;2009

See also: Biot-Savart Law, Flux Density, Tesla.

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Subjects: Electromagnetism