Tesla (unit)
Categories: SI derived units | Units of magnetic flux density | Nikola Tesla
The tesla (symbol T) is the SI derived unit of magnetic flux density (or magnetic induction).
Contents |
Definition
1 T = 1 Wb/m2 = 1 kg·s–2·A–1
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
It is 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.
Conversions
1 tesla is equivalent to:
- 10 000 gauss.
Examples
- 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 20 µT (2×10-5 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 4 T, experimentally up to 7 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 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 for any known phenomenon, 1013 T.
Geophysics uses a non-SI unit called the gamma, 1 γ = 10-9 T = 1 nT.
The CGS unit is the gauss = 10-4 T.
SI units
| SI electromagnetic units
| |||
|---|---|---|---|
| Current | ampere (SI base unit) | A | A |
| Electric charge, Quantity of electricity | coulomb | C | A·s |
| Potential difference | volt | V | J/C = kg·m2·s−3·A−1 |
| Resistance, Impedance, Reactance | ohm | Ω | V/A = kg·m2·s−3·A−2 |
| Resistivity | ohm metre | Ω·m | kg·m3·s−3·A−2 |
| Electrical power | watt | W | V·A = kg·m2·s−3 |
| Capacitance | farad | F | C/V = kg−1·m−2·A2·s4 |
| Elastance | reciprocal farad | F−1 | kg·m2·A−2·s−4 |
| Permittivity | farad per metre | F/m | kg−1·m−3·A2·s4 |
| Conductance, Admittance, Susceptance | siemens | S | Ω−1 = kg−1·m−2·s3·A2 |
| Conductivity | siemens per metre | S/m | kg−1·m−3·s3·A2 |
| Magnetic flux | weber | Wb | V·s = kg·m2·s−2·A−1 |
| Magnetic flux density | tesla | T | Wb/m2 = kg·s−2·A−1 |
| Magnetic induction | ampere per metre | A/m | A·m−1 |
| Reluctance | ampere-turns per weber | A/Wb | kg−1·m−2·s2·A2 |
| Inductance | henry | H | Wb/A = V·s/A = kg·m2·s−2·A−2 |
| Permeability | henry per metre | H/m | kg·m·s−2·A−2 |
| Magnetic susceptibility | (dimensionless) | χ | - |
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