Tesla (unit)

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The tesla (symbol T) is the SI derived unit of magnetic flux density (or magnetic induction). It is a unit to define the intensity (density) of a magnetic field.

Contents

1 Definition
2 SI multiples
3 Origin
4 Explanation
5 Conversions
6 Examples
7 Reference

Definition

1 T = 1 Wb·m^{-2^{= 1 kg·s^–2·A^–1= 1N·A^–1·m^{-1^{= 1 kg·s^–1·C^–1}}}}

This SI unit is named after Nikola Tesla. As for 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.

SI multiples

Multiple	Name	Symbol	Multiple	Name	Symbol
10⁰	tesla	T
10¹	decatesla	daT	10^–1	decitesla	dT
10²	hectotesla	hT	10^–2	centitesla	cT
10³	kilotesla	kT	10^–3	millitesla	mT
10⁶	megatesla	MT	10^–6	microtesla	µT
10⁹	gigatesla	GT	10^–9	nanotesla	nT
10¹²	teratesla	TT	10^–12	picotesla	pT
10¹⁵	petatesla	PT	10^–15	femtotesla	fT
10¹⁸	exatesla	ET	10^–18	attotesla	aT
10²¹	zettatesla	ZT	10^–21	zeptotesla	zT
10²⁴	yottatesla	YT	10^–24	yoctotesla	yT

Origin

The tesla was adopted in 1960, and named in honor of the Serbian-American inventor and electrical engineer Nikola Tesla.

Explanation

The tesla is the value of the total magnetic flux (a magnet's "power") divided by area. Hence, reducing the affected area will generally increase the magnetic flux density.

This will continue to occur until the material becomes magnetically saturated and/or the magnetic field "leakage" increases so fast that no additional tesla gains are possible. #redirect

Conversions

1 tesla is equivalent to:

10,000 gauss (G), used in CGS system
10⁹ gammas (γ), used in geophysics

Examples

The strongest (non-pulsed) magnet in the world is located in Tallahasee, FL.

In outer space the magnetic flux density is between 0.1 and 10 nanoteslas (10⁻¹⁰ T and 10⁻⁸ T),
in the 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 the magnetic field of a huge horseshoe magnet 1 millitesla (0.001 T),
a large 30 pound loudspeaker magnet will have a coil gap of 1 T
in medical magnetic resonance imaging up to 7 T, experimentally up to 20 T,
in a sunspot 10 T,
strongest continuous magnetic field yet produced in a laboratory (Florida State University's National High Magnetic Field Laboratory [link] in Tallahassee, USA), 45 T [link],
strongest (pulsed) magnetic field yet obtained non-destructively in a laboratory (Koichi Kindo at Osaka University [link]), 80 T,
strongest (pulsed) magnetic field ever obtained (with explosives) in a laboratory (Sarov, Russia), 2800 T,
on a neutron star 1 to 100 megateslas (10⁶ T to 10⁸ T),
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).

Reference

[sizes.com] - date of adoption

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