Tesla (unit)
The tesla (symbol T) is the SI derived unit of magnetic flux density (or magnetic inductivity). At the Conf廨ence G幯廨ale des Poids et Mesures (CGPM) in Paris in 1960, the unit was named in honor of the Serbian-American inventor and electrical engineer Nikola Tesla who made several important contributions to the field of electromagnetism.
Examples
- In outer space the magnetic flux density is between 10-10 T and 10-8 T,
- in the Earth's magnetic field at latitude of 50° is 2 · 10-5 T and on the equator at a latitude of 0° is 3.1 · 10-5 T,
- in the magnetic field of a huge horseshoe magnet 0.001 T,
- in medical magnetic resonance imaging up to 4 T,
- in a sunspot 10 T,
- strongest continuous magnetic field yet produced in a laboratory (Florida State University's National High Magnetic Field Laboratory [1] in Tallahassee, USA), 45 T [2],
- strongest (pulsed) magnetic field yet obtained non-destructively in a laboratory (Koichi Kindo at Osaka University [3]), 80 T,
- strongest (pulsed) magnetic field ever obtained (with explosives) in a laboratory (Sarov, Russia), 2800 T,
- on a neutron star 106 T to 108 T,
- on a magnetar, 108 to 1011 T,
- maximum theoretical field strength for a neutron star, and therefore for any known phenomenon, 1013 T.
Geophysics uses a non-SI unit called the gamma, 1 γ = 10 -9 T.
The CGS unit is the gauss = 10-4 T.
SI units
| SI electromagnetism units edit | |||
|---|---|---|---|
| Name | Symbol | Dimensions | Quantity |
| ampere (SI base unit) | A | A | Current |
| coulomb | C | A新 | Electric charge, Quantity of electricity |
| volt | V | J/C = kg搶2新−3嫂−1 | Potential difference |
| ohm | Ω | V/A = kg搶2新−3嫂−2 | Resistance, Impedance, Reactance |
| ohm metre | Ω搶 | kg搶3新−3嫂−2 | Resistivity |
| watt | W | V嫂 = kg搶2新−3 | Electrical power |
| farad | F | C/V = kg−1搶−2嫂2新4 | Capacitance |
| farad per metre | F/m | kg−1搶−3嫂2新4 | Permittivity |
| reciprocal farad | F−1 | kg1搶2嫂−2新−4 | Elastance |
| siemens | S | Ω−1 = kg−1搶−2新3嫂2 | Conductance, Admittance, Susceptance |
| siemens per metre | S/m | kg−1搶−3新3嫂2 | Conductivity |
| weber | Wb | V新 = kg搶2新−2嫂−1 | Magnetic flux |
| tesla | T | Wb/m2 = kg新−2嫂−1 | Magnetic flux density |
| ampere per metre | A/m | m−1嫂 | magnetic induction |
| ampere-turns per weber | A/Wb | kg−1搶−2新2嫂2 | Reluctance |
| henry | H | Wb/A = V新/A = kg搶2新−2嫂−2 | Inductance |
| henry per metre | H/m | kg搶新−2嫂−2 | Permeability |
| (dimensionless) | χ | - | Magnetic susceptibility |