This page lists examples of magnetic induction B in teslas and gauss produced by various sources, grouped by orders of magnitude.
The magnetic flux density does not measure how strong a magnetic field is, but only how strong the magnetic flux is in a given point or at a given distance (usually right above the magnet's surface). For the intrinsic order of magnitude of magnetic fields, see: Orders of magnitude (magnetic moment).
Note: Traditionally, the 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 inverse cube of the distance from a dipole source. Energy required to produce laboratory magnetic fields increases with the square of magnetic field.
Examples These examples attempt to make the measuring point clear, usually the surface of the item mentioned.
+Magnetic field strength (from lower to higher orders of magnitude) Factor (tesla) SI name SI Value CGS Value Example of magnetic field strength10−18 Tattotesla Sensitivity of Gravity Probe B gyroscope's "SQUID" magnetometer (most sensitive when averaged over days)Range, Shannon K'doah. Gravity Probe B: Examining Einstein's Spacetime with Gyroscopes. National Aeronautics and Space Administration. October 2004.10−17 T10−16 T10−15 Tfemtotesla 10−14 T10−13 T Human brain10−12 Tpicotesla 10−11 T "Potholes" in the magnetic field found in the heliosheath around the Solar System reported by Voyager 1 (NASA, 2006)10−10 THeliosphere10−9 Tnanotesla 10−8 T 10−7 TCoffeemaker ( away) to to Residential electric distribution lines (34.5 kV) ( away)10−6 TmicroteslaBlender ( away) to to High power (500 kV) transmission lines ( away) Microwave oven ( away)10−5 TMagnetic tape near tape head Earth's magnetic field at 0° latitude (on the equator) Earth's magnetic field at 50° latitude10−4 TMagnetic flux density that will induce an electromotive force of 10−8 volts in each centimeter of a wire moving perpendicularly at 1 by definition (1 gauss = 1 )Suggested exposure limit for cardiac pacemakers by American Conference of Governmental Industrial Hygienists (ACGIH)10−3 TmilliteslaRefrigerator magnets ( to )10−2 TcentiteslaPenny-sized ferrite magnet 10−1 T decitesla Penny-sized neodymium magnetSunspot100 TteslaInside the core of a 60 Hz power transformer ( to ) or voice coil gap of a loudspeaker magnet ( to ) to to Medical magnetic resonance imaging systems (in practice) Experimental magnetic resonance imaging systems: NMR spectrometer at 400 MHz () to 500 MHz ()101 Tdecatesla Levitate a frog by distorting its atomic orbitals 1 GHz NMR spectrometer Strongest continuous magnet field produced by all-superconducting magnet Strongest continuous magnetic field produced by non-superconductive resistive magnet Strongest non-tiny continuous magnetic field produced in a laboratory (Steady High Magnetic Field Facility (SHMFF) in Hefei, China, 2022), beating previous 45 T record (National High Magnetic Field Laboratory's FSU, USA, 1999) (both are hybrid magnets, combining a superconducting magnet with a resistive magnet)Strongest continuous magnetic field produced in a laboratory (National High Magnetic Field Laboratory's FSU, USA, 2019), though the magnet is tiny (only 390 grams) 102 T hectotesla Strongest pulsed non-destructive ("multi-shot") magnetic field produced in a laboratory (Pulsed Field Facility at National High Magnetic Field Laboratory's Los Alamos National Laboratory, Los Alamos, New Mexico, USA)103 Tkilotesla Record for indoor pulsed magnetic field, (University of Tokyo, Japan, 2018) Record for human produced, pulsed magnetic field (VNIIEF, Russia, 2001) 104 T Felt by valence electrons in a xenon atom due to the spin–orbit effect105 TNon-magnetar neutron stars106 Tmegatesla107 T108 T109 TgigateslaSchwinger limit (c. 4.41 GT) above which the electromagnetic field becomes nonlinearSwift J0243.6+6124, most magnetic pulsar known1010 TMagnetar neutron stars 1011 T 1012 Tteratesla1 TT10 PG1013 T10 TT100 PG 1014 T Magnetic fields inside heavy ion collisions at RHIC
References
See also Orders of magnitude (magnetic moment)