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Tesla (unit)

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The tesla (symbol T) is the SI derived unit of magnetic field B (which is also known as "magnetic flux density" and "magnetic induction"). The tesla is equal to one weber per square meter and was defined in 1960^[1] in honor of inventor, scientist and electrical engineer Nikola Tesla. One millionth of a Tesla is a Nanotesla, equivalent to .01 MGauss, and it is in Nanotesla that common metric home measurements are made to determine local magnetic field exposure.

1 Definition
2 Conversions
3 Examples
4 References

Definition

This SI unit is named after Nikola Tesla. As with every SI unit whose name is 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 where any word would be capitalized, such as at the beginning of a sentence or in capitalized material such as a title. Note that "degree Celsius" conforms to this rule because the "d" is lowercase.

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

As an SI derived unit, the tesla can also be expressed as:

$\mathrm{1\, T = 1\,\frac{V\cdot s}{m^2} = 1\,\frac{N}{A\cdot m} = 1\,\frac{Wb}{m^2} = 1\,\frac{kg}{C\cdot s}} = 1\,\frac{kg}{A\cdot s^2}$ (In SI base units)

Units used:

A = ampere
C = coulomb
kg = kilogram
m = meter
N = newton
s = second
T = tesla
V = volt
Wb = weber

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)

For those concerned about low-frequency electro-magnetic radition in the home, the following conversions are needed most:

1000 Nanotesla = 1 Microtesla = 10 MilliGauss (mG)
1000000 Microtesla = 1 Tesla

200 Nanotesla = US Congress and WHO Recommended limit for constant human exposure = 2 mG

For the relation to the units of the magnetizing field (Amperes/Meter or Oersted) see the article on permeability.

Examples

Main article: Orders of magnitude (magnetic field)

References

^ sizes.com - details of SI units

Retrieved from "http://en.wikipedia.org/wiki/Tesla_(unit)"

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

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