Tesla (unit)

The tesla (symbol: T) is the unit of magnetic flux density (also called magnetic B-field strength) in the International System of Units (SI).

One tesla is equal to one

.

Definition

A particle, carrying a charge of one

Lorentz force law

. That is,

$${\displaystyle \mathrm {T={\dfrac {N{\cdot }s}{C{\cdot }m}}} .}$$

As an

That is,

$${\displaystyle \mathrm {T={\dfrac {Wb}{m^{2}}}} .}$$

Expressed only in SI base units, 1 tesla is:

$${\displaystyle \mathrm {T={\dfrac {kg}{A{\cdot }s^{2}}}} ,}$$

Additional equivalences result from the derivation of coulombs from amperes (A), ${\displaystyle \mathrm {C=A{\cdot }s} }$:

$${\displaystyle \mathrm {T={\dfrac {N}{A{\cdot }m}}} ,}$$

${\displaystyle \mathrm {J=N{\cdot }m} }$

$${\displaystyle \mathrm {T={\dfrac {J}{A{\cdot }m^{2}}}} ,}$$

${\displaystyle \mathrm {Wb=V{\cdot }s} }$

$${\displaystyle \mathrm {T={\dfrac {V{\cdot }{s}}{m^{2}}}} .}$$

Electric vs. magnetic field

In the production of the

One tesla is equivalent to:[7]^{[page needed]}

For the relation to the units of the

The following examples are listed in the ascending order of the magnetic-field strength.

• 3.2×10⁻⁵ T (31.869 μT) – strength of Earth's magnetic field at 0° latitude, 0° longitude
• 4×10⁻⁵ T (40 μT) – walking under a
  high-voltage power line^[9]
• 5×10⁻³ T (5 mT) – the strength of a typical refrigerator magnet
• 0.3 T – the strength of solar sunspots
• 1 T to 2.4 T – coil gap of a typical loudspeaker magnet
• 1.5 T to 3 T – strength of medical magnetic resonance imaging systems in practice, experimentally up to 17 T^[10]
• 4 T – strength of the superconducting magnet built around the CMS detector at CERN^[11]
• 5.16 T – the strength of a specially designed room temperature Halbach array^[12]
• 8 T – the strength of
  LHC
  magnets
• 11.75 T – the strength of INUMAC magnets, largest
  MRI scanner^[13]
• 13 T – strength of the superconducting ITER magnet system^[14]
• 14.5 T – highest magnetic field strength ever recorded for an accelerator steering magnet at Fermilab^[15]
• 16 T – magnetic field strength required to levitate a frog^[16] (by diamagnetic levitation of the water in its body tissues) according to the 2000 Ig Nobel Prize in Physics^[17]
• 17.6 T – strongest field trapped in a superconductor in a lab as of July 2014^[18]
• 20 T - strength of the large scale high temperature superconducting magnet developed by MIT and Commonwealth Fusion Systems to be used in fusion reactors^{[citation needed]}
• 27 T – maximal field strengths of superconducting electromagnets at cryogenic temperatures
• 35.4 T – the current (2009) world record for a superconducting electromagnet in a background magnetic field^[19]
• 45 T – the current (2015) world record for continuous field magnets^[19]
• 97.4 T – strongest magnetic field produced by a "non-destructive" magnet^[20]
• 100 T – approximate magnetic field strength of a typical white dwarf star
• 1200 T – the field, lasting for about 100 microseconds, formed using the electromagnetic flux-compression technique^[21]
• 10⁹ T – Schwinger limit above which the electromagnetic field itself is expected to become nonlinear
• 10⁸ – 10¹¹ T (100 MT – 100 GT) – magnetic strength range of magnetar neutron stars

Notes and references

External links

Look up tesla in Wiktionary, the free dictionary.

• Gauss ↔ Tesla Conversion Tool