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MOTION MOUNTAIN

LIGHT, CHARGES AND BRAINS - Motion Mountain

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liquid electricity, invisible fields and maximum speed 35<br />

TA B L E 8 Some observed magnetic fields.<br />

Observation<br />

Magnetic field<br />

Ref. 18<br />

Lowest measured magnetic field (e.g., fields of the Schumann 1 fT<br />

resonances)<br />

Magnetic field produced by brain currents 0.1 pT to3 pT<br />

Magnetic field produced by single muscle action 1 pT<br />

Intergalactic magnetic fields 1 pT to10 pT<br />

Magnetic field in the human chest, due to heart currents 100 pT<br />

Magnetic field of our galaxy 0.5 nT<br />

Magnetic field due to solar wind<br />

0.2 to80 nT<br />

Magnetic field directly below high voltage power line 0.1 to1 µT<br />

Magnetic field of Earth 20 to70 µT<br />

Magnetic field inside home with electricity 0.1 to100 µT<br />

Magnetic field near mobile phone 100 µT<br />

Magnetic field that influences visual image quality in the dark 100 µT<br />

Magnetic field near iron magnet 100 mT<br />

Solar spots 1 T<br />

Magnetic fields near high technology permanent magnet<br />

max1.3 T<br />

Magnetic fields that produces sense of coldness in humans 5 T or more<br />

Magnetic fields in particle accelerator 10 T<br />

Maximum static magnetic field produced with superconducting coils22 T<br />

Highest static magnetic fields produced in laboratory, using hybrid 45 T<br />

magnets<br />

Highestpulsed magnetic fields produced without coil destruction 76 T<br />

Pulsed magnetic fields produced, lasting about1 µs, using imploding 1000 T<br />

coils<br />

Field of white dwarf 10 4 T<br />

Fields in petawatt laser pulses 30 kT<br />

Field of neutron star<br />

from10 6 T to10 11 T<br />

Quantum critical magnetic field 4.4 GT<br />

Highest field ever measured, on magnetar and soft gamma repeater 0.8 to1⋅10 11 T<br />

SGR-1806-20<br />

Estimated magnetic field near atomic nucleus 1 TT<br />

Maximum possible magnetic field in nature (corrected Planck 6.3⋅10 53 T<br />

magnetic fieldc 3 /4Ge)<br />

Magnets and other magnetic materials<br />

Thestudyofmagnetismprogressedacrosstheworldindependentlyofthestudyofelectricity.<br />

Towards the end of the twelfth century, the compass came into use in Europe.<br />

At that time, there still were heated debates on whether it pointed to the north or<br />

the south. Then, in 1269, the military engineer Pierre de Maricourt (b. 1219 Maricourt,<br />

d. 1292unknown) publishedhisstudy ofmagneticmaterials. Hefoundthateverymag-<br />

Motion Mountain – The Adventure of Physics copyright © Christoph Schiller June 1990–November 2015 free pdf file available at www.motionmountain.net

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