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Tesla (unit)

The tesla (symbol T) is the SI derived unit of magnetic field (specifically magnetic flux density). The tesla is equal to one weber per square metre and was defined in 1960[1] in honor of inventor, scientist and electrical engineer Nikola Tesla.



\mathrm{1\, T = 1\,\frac{V\cdot s}{m^2} = 1\,\frac{N}{A\cdot m} = 1\,\frac{Wb}{m^2} = 1\,\frac{kg}{A\cdot s^2} = 1\,\frac{kg}{C\cdot s}}
This SI unit is named after Nikola Tesla. As with all SI units whose names are derived from the proper name of a person, the first letter of its symbol is uppercase (T). But when an SI unit is spelled out, it should always be written in lowercase (tesla), unless it begins a sentence or is the name "degree Celsius".
— Based on The International System of Units, section 5.2.


1 tesla is equivalent to:

  • 10,000 (or 104) gauss (G), used in CGS system. Thus, 10G = 1mT (1 millitesla)
  • 1,000,000,000 (or 109) gammas (γ), used in geophysics. Thus, 1γ = 1nT (nanotesla)



  • In September 2006, NASA found "potholes" in the magnetic field in the heliosheath around our solar system that are 10 picoteslas as reported by Voyager 1[2]
  • In outer space the magnetic field is between 0.1 and 10 nanoteslas (10−10 T and 10−8 T)
  • Earth's magnetic field at latitude of 50° is 58 µT (5.8×10−5 T) and on the equator at a latitude of 0° is 31 µT (3.1×10−5 T)
  • In a sunspot, the magnetic field is about 150 mT
  • A large 14 kg loudspeaker magnet has a coil gap of 1 T[citation needed].
  • A modern neodymium-iron-boron (NdFeB) rare earth magnet has a strength of about 1.25 T. A coin-sized neodymium magnet can lift more than 9 kg, and can pinch skin and erase credit cards.[citation needed]
  • Medical magnetic resonance imaging systems utilize fields from 1.5 to 3 T in practice, experimentally up to 7 T,[3]
  • To levitate a frog, 16 T are required.[4]
  • Strongest continuous magnetic field yet produced in a laboratory (Florida State University's National High Magnetic Field Laboratory in Tallahassee, USA), 45 T [5].
  • Strongest (pulsed) magnetic field yet obtained non-destructively in a laboratory (LANL [6][7]), 100 T
  • Strongest (pulsed) magnetic field ever obtained (with explosives) in a laboratory (VNIIEF in Sarov, Russia, 1998), 2.8 kT [8]
  • On a magnetar, 0.1 to 100 gigateslas (108 to 1011 T)
  • Maximum theoretical field strength for a neutron star, and therefore the upper bound thus far for any known phenomenon, 1013 T (10 terateslas)


  1. ^ - details of SI units
  2. ^ Surprises from the Edge of the Solar System. NASA (2006-09-21).
  3. ^ Smith, Hans-Jørgen. Magnetic resonance imaging. Medcyclopaedia Textbook of Radiology. GE Healthcare. Retrieved on 2007-03-26.
  4. ^ Frog defies gravity.
  5. ^ World's Most Powerful Magnet Tested Ushers in New Era for Steady High Field Research. National High Magnetic Field Laboratory.
  6. ^ Laboratory sets high magnetic field records. LANL (2006-08-31).
  7. ^ One-of-a-kind magnet open for science. (2006-10-25).
  8. ^ With record magnetic fields to the 21st Century. IEEE Xplore.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Tesla_(unit)". A list of authors is available in Wikipedia.
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