This page lists examples of magnetic induction B in teslas and gauss produced by various sources, grouped by orders of magnitude.
Note:
- 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 inverse cube of the distance (1/distance3) 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.
| Factor (tesla) | SI name | SI Value | CGS Value | Example of magnetic field strength |
|---|---|---|---|---|
| 10−18 T | attotesla | 1 aT | 10 fG | |
| 5 aT | 50 fG | Sensitivity of Gravity Probe B gyroscope's "SQUID" magnetometer (most sensitive when averaged over days) | ||
| 10−17 T | 10 aT | 100 fG | ||
| 10−16 T | 100 aT | 1 pG | ||
| 10−15 T | femtotesla | 1 fT | 10 pG | |
| 2 fT | 20 pG | |||
| 10−14 T | 10 fT | 100 pG | ||
| 10−13 T | 100 fT | 1 nG | Human brain | |
| 10−12 T | picotesla | 1 pT | 10 nG | |
| 10−11 T | 10 pT | 100 nG | "Potholes" in the magnetic field found in the heliosheath around the Solar System reported by Voyager 1 (NASA, 2006) | |
| 10−10 T | 100 pT | 1 μG | Heliosphere | |
| 10−9 T | nanotesla | 1 nT | 10 μG | |
| 10−8 T | 10 nT | 100 μG | ||
| 10−7 T | 100 nT | 1 mG | Coffeemaker (30 cm or 1 ft away) | |
| 100 nT to 500 nT | 1 mG to 5 mG | Residential electric distribution lines (34.5 kV) (15 m or 49 ft away) | ||
| 10−6 T | microtesla | 1 μT | 10 mG | Blender (30 cm or 1 ft away) |
| 1.3 μT to 2.7 μT | 13 mG to 27 mG | High power (500 kV) transmission lines (30 m or 100 ft away) | ||
| 6 μT | 60 mG | Microwave oven (30 cm or 1 ft away) | ||
| 10−5 T | 10 μT | 100 mG | ||
| 24 μT | 240 mG | Magnetic tape near tape head | ||
| 31 μT | 310 mG | Earth's magnetic field at 0° latitude (on the equator) | ||
| 58 μT | 580 mG | Earth's magnetic field at 50° latitude | ||
| 10−4 T | 100 μT | 1 G | Magnetic flux density that will induce an electromotive force of 10-8 volts in each centimeter of a wire moving perpendicularly at 1 centimeter/second by definition (1 gauss = 1 maxwell/centimeter²) | |
| 500 μT | 5 G | Suggested exposure limit for cardiac pacemakers by American Conference of Governmental Industrial Hygienists (ACGIH) | ||
| 10−3 T | millitesla | 1 mT | 10 G | Refrigerator magnets (10 G to 100 G) |
| 10−2 T | centitesla | 10 mT | 100 G | |
| 30 mT | 300 G | Penny-sized ferrite magnet | ||
| 10−1 T | decitesla | 100 mT | 1 kG | Penny-sized neodymium magnet |
| 150 mT | 1.5 kG | Sunspot | ||
| 100 T | tesla | 1 T | 10 kG | Inside the core of a 60 Hz power transformer (1 T to 2 T as of 2001[update]) or voice coil gap of a loudspeaker magnet (1 T to 2.4 T as of 2006[update]) |
| 1.5 T to 7 T | 15 kG to 70 kG | Medical magnetic resonance imaging systems (in practice) | ||
| 9.4 T | 94 kG | Experimental magnetic resonance imaging systems: NMR spectrometer at 400 MHz (9.4 T) to 500 MHz (11.7 T) | ||
| 101 T | decatesla | 10 T | 100 kG | |
| 11.7 T | 117 kG | |||
| 16 T | 160 kG | Levitate a frog by distorting its atomic orbitals | ||
| 23.5 T | 235 kG | 1 GHz NMR spectrometer | ||
| 32 T | 235 kG | Strongest continuous magnet field produced by all-superconducting magnet | ||
| 38 T | 380 kG | Strongest continuous magnetic field produced by non-superconductive resistive magnet | ||
| 45.22 T | 452.2 kG | 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) | ||
| 45.5 T | 455 kG | 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 | 100 T | 1 MG | 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, NM, USA) |
| 103 T | kilotesla | 1 kT | 10 MG | |
| 1.2 kT | 12 MG | Record for indoor pulsed magnetic field, (University of Tokyo, 2018) | ||
| 2.8 kT | 28 MG | Record for human produced, pulsed magnetic field, (VNIIEF, 2001) | ||
| 104 T | 10 kT | 100 MG | ||
| 35 kT | 350 MG | Felt by valence electrons in a xenon atom due to the spin–orbit effect | ||
| 105 T | 100 kT | 1 GG | Non-magnetar neutron stars | |
| 106 T | megatesla | 1 MT | 10 GG | |
| 107 T | 10 MT | 100 GG | ||
| 108 T | 100 MT | 1 TG | ||
| 109 T | gigatesla | 1 GT | 10 TG | Schwinger limit (~4.41 GT) above which the electromagnetic field becomes nonlinear |
| 1010 T | 10 GT | 100 TG | Magnetar neutron stars | |
| 1011 T | 100 GT | 1 PG | ||
| 1012 T | teratesla | 1 TT | 10 PG | |
| 1013 T | 10 TT | 100 PG | ||
| 16 TT | 160 PG | Swift J0243.6+6124 most magnetic pulsar | ||
| 1014 T | 100 TT | 1 EG | Magnetic fields inside heavy ion collisions at RHIC | |