Tesla (unit)




The tesla (symbol T) is the weber per square metre and was defined in 1960[1] in honor of inventor, scientist and electrical engineer Nikola Tesla.

Definition

\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 Celsius".
— Based on The International System of Units, section 5.2.

Conversions

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)

Examples

 

picoteslas
  • 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]
nanoteslas
  • In outer space the magnetic field is between 0.1 and 10 nanoteslas (10−10 T and 10−8 T)
microteslas
  • 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)
milliteslas
  • In a sunspot, the magnetic field is about 150 mT
teslas
  • 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
kiloteslas
  • Strongest (pulsed) magnetic field ever obtained (with explosives) in a laboratory (VNIIEF in Sarov, Russia, 1998), 2.8 kT [8]
megateslas
gigateslas
  • On a magnetar, 0.1 to 100 gigateslas (108 to 1011 T)
terateslas
  • Maximum theoretical field strength for a neutron star, and therefore the upper bound thus far for any known phenomenon, 1013 T (10 terateslas)

References

  1. ^ sizes.com - 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. PhysOrg.com (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.