Magnetic field strength
The strength of a magnetic field is measured in (SI) units of Tesla. In fact, 1 Tesla (T) represents a very strong magnetic field. For example, the magnetic field at the Earth's surface at Halley has a strength of roughly 1/20000 T or 5x10-5 T. So normally we choose to express the magnetic field strength in terms of nanoTesla (nT), where 1 nT = 10-9 T. Thus, the magnetic field at Halley is roughly 50000 nT. Occasionally, the unit "gamma" (gamma) may be referred to: 1 gamma = 1 nT.
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