Tesla (unit)

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Categories: SI derived units | Units of magnetic flux density | Nikola Tesla

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.

1 Definition
2 Conversions
3 Examples
4 Trivia
5 References

Definition

Failed to parse (Missing texvc executable; please see math/README to configure.): \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). When an SI unit is spelled out in English, it should always begin with a lowercase letter (tesla), except for at the beginning of a sentence or in capitalized material such as a title. Note that "degree Celsius" conforms to this rule because of the "d".

— 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, 10 G = 1 mT (1 millitesla)
1,000,000,000 (or 10⁹) gammas (γ), used in geophysics. Thus, 1 γ = 1 nT (nanotesla)

Examples

Image:Small small IMG 0836.jpg

The strongest (non-pulsed) magnet in the world is located in Tallahassee, Florida, USA.

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 typical loudspeaker magnet has a coil gap of from 1 T up to around 2.4 T^[3]. A modern neodymium-iron-boron (Nd₂Fe₁₄B) 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.^[4] Medical magnetic resonance imaging systems utilize fields from 1.5 to 3 T in practice, experimentally up to 7 T,^[5] To levitate a frog, 16 T are required.^[6] Strongest continuous magnetic field yet produced in a laboratory (Florida State University's National High Magnetic Field Laboratory in Tallahassee, USA), 45 T ^[7]. Strongest (pulsed) magnetic field yet obtained non-destructively in a laboratory (LANL ^[8]^[9]), 100 T
kiloteslas	Strongest (pulsed) magnetic field ever obtained (with explosives) in a laboratory (VNIIEF in Sarov, Russia, 1998), 2.8 kT ^[10]
megateslas	On a neutron star 1 to 100 megateslas (10⁶ T to 10⁸ T)
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)