Orders of magnitude (magnetic field)
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This page lists examples of magnetic induction B in teslas and gauss produced by various sources, grouped by orders of magnitude, with each group covering three orders of magnitude, or a factor of one thousand.
- Traditionally, magnetizing field H, is measured in amperes per meter. Magnetic induction B (also known as magnetic flux density) has the SI unit tesla [T or Wb/m2]. One tesla is equal to 104 gauss.
- Magnetic field drops off as the cube of the distance from a dipole source. These examples attempt to make the measuring point clear, usually the surface of the item mentioned.
|Factor (tesla)||SI prefix||Value (SI units)||Value (CGS units)||Item|
|10−18||attotesla||5 aT||50 fG||SQUID magnetometers on Gravity Probe B gyroscopes measure fields at this level over several days of averaged measurements|
|10−15||femtotesla||2 fT||20 pG||SQUID magnetometers on Gravity Probe B gyros measure fields at this level in about one second|
|10−12||picotesla||100 fT to 1 pT||1 nG to 10 nG||human brain magnetic field|
|10−11||10 pT||100 nG||In September 2006, NASA found "potholes" in the magnetic field in the heliosheath around our solar system that are 10 picoteslas as reported by Voyager 1|
|10−9||nanotesla||100 pT to 10 nT||1 µG to 100 µG||magnetic field strength in the heliosphere|
|10−6||microtesla||24 µT||240 mG||strength of magnetic tape near tape head|
|10−5||31 µT||310 mG||strength of Earth's magnetic field at 0° latitude (on the equator)|
|58 µT||580 mG||strength of Earth's magnetic field at 50° latitude|
|10−3||millitesla||0.5 mT||5 G||the suggested exposure limit for cardiac pacemakers by American Conference of Governmental Industrial Hygienists (ACGIH)|
|5 mT||50 G||the strength of a typical refrigerator magnet |
|10−1||0.15 T||1.5 kG||the magnetic field strength of a sunspot|
|100||tesla||1 T to 2.4 T||10 kG to 24 kG||coil gap of a typical loudspeaker magnet.|
|1 T to 2 T||10 kG to 20 kG||inside the core of a modern 60 Hz power transformer|
|1.25 T||12.5 kG||strength of a modern neodymium–iron–boron (Nd2Fe14B) rare earth magnet. A coin-sized neodymium magnet can lift more than 9 kg, pinch skin and erase credit cards.|
|1.5 T to 3 T||15 kG to 30 kG||strength of medical magnetic resonance imaging systems in practice, experimentally up to 8 T|
|9.4 T||94 kG||Modern high resolution research magnetic resonance imaging system; field strength of a 400 MHz NMR spectrometer|
|101||11.7 T||117 kG||field strength of a 500 MHz NMR spectrometer|
|16 T||160 kG||strength used to levitate a frog|
|23.5 T||235 kG||field strength of a 1 GHz NMR spectrometer|
|36.2 T||362 kG||strongest continuous magnetic field produced by non-superconductive resistive magnet.|
|45 T||450 kG||strongest continuous magnetic field yet produced in a laboratory (Florida State University's National High Magnetic Field Laboratory in Tallahassee, USA).|
|730 T||7.3 MG||strongest pulsed magnetic field yet obtained in a laboratory, destroying the used equipment, but not the laboratory itself (Institute for Solid State Physics, Tokyo)|
|103||kilotesla||2.8 kT||28 MG||strongest (pulsed) magnetic field ever obtained (with explosives) in a laboratory (VNIIEF in Sarov, Russia, 1998)|
|106||megatesla||1 MT to 100 MT||10 GG to 1 TG||strength of a neutron star|
|109||gigatesla||100 MT to 100 GT||1 TG to 1 PG||strength of a magnetar|
- "Bureau International des Poids et Mesures, The International System of Units (SI), 8th edition 2006" (PDF). bipm.org. 2012-10-01. Retrieved 2013-05-26.
-  Gravity Probe B
- "Surprises from the Edge of the Solar System". NASA. 2006-09-21.
- "Information on MRI Technique". Nevus Network. Retrieved 2014-01-28.
- Elliot, Rod. "Power Handling Vs. Efficiency". Retrieved 2008-02-17.
- "Inductors and transformers" (PDF). eece.ksu.edu. 2003-08-12. Retrieved 2013-05-26.
A modern well-designed 60 Hz power transformer will probably have a magnetic flux density between 1 and 2 T inside the core.[dead link]
- "Trafo-Bestimmung 3von3". radiomuseum.org. 2009-07-11. Retrieved 2013-06-01.
- The Tesla Radio Conspiracy
- Smith, Hans-Jørgen. "Magnetic resonance imaging". Medcyclopaedia Textbook of Radiology. GE Healthcare. Retrieved 2007-03-26.
- Orenstein, Beth W. (2006-02-16). "Ultra High-Field MRI — The Pull of Big Magnets". Radiology Today 7 (3). p. 10. Archived from the original on March 15, 2008. Retrieved 2008-07-10.
- "Frog defies gravity".
- "23.5 Tesla Standard-Bore, Persistent Superconducting Magnet".
- "Mag Lab Reclaims World Record for Highest Field Resistive Magnet".
- "World's Most Powerful Magnet Tested Ushers in New Era for Steady High Field Research". National High Magnetic Field Laboratory.
- "With record magnetic fields to the 21st Century". IEEE Xplore.