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Magnetic fields are produced by electric currents, which can be macroscopic currents in wires, or microscopic currents associated with electrons in atomic orbits. The magnetic field B is defined in terms of force on moving charge in the Lorentz force law.
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hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfie.htm...
hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfie.html
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News, facts and features about the National High Magnetic Field Laboratory. ... October 28, 2009 — The National High Magnetic Field Laboratory has been awarded nearly $3 million to build a novel kind of superconducting magnet that will break records for magnetic field strength, make possible new types of science and save...
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www.magnet.fsu.edu/mediacenter/
www.magnet.fsu.edu/mediacenter/
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Britannica online encyclopedia article on magnetic field (physics), region in the neighbourhood of a magnet, electric current, or changing electric field, in which magnetic forces are observable. ... the other, called the magnetic field strength, or magnetic field intensity, is symbolized by H. The magnetic field H might...
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www.britannica.com/EBchecked/topic/357048/magnetic-fiel...
www.britannica.com/EBchecked/topic/357048/magnetic-field
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Magnetic Field: B ... At every point in space surrounding a magnet, a moving charge, or a wire carrying current there is a force field called the magnetic field; denoted by the symbol B. ... The magnetic field B is a vector quantity in that it has both size and direction at every point in space.
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www.ac.wwu.edu/~vawter/PhysicsNet/Topics/MagneticField/...
www.ac.wwu.edu/~vawter/PhysicsNet/Topics/MagneticField/MField.html
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Earth's magnetic field - Wikipedia, the free encyclopedia
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Earth's magnetic field (and the surface magnetic field ) is approximately a magnetic dipole, with the magnetic field S pole near the Earth's geographic north pole (see Magnetic North Pole) and the ...
en.wikipedia.org/wiki/Earth's_magnetic_field
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Only a few of the phenomena observed on the ground come from the magnetosphere: fluctuations of the magnetic field known as magnetic storms and substorms, and the polar aurora or "northern lights," appearing in the night skies of places like Alaska and Norway.
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www-istp.gsfc.nasa.gov/Education/Imagnet.html
www-istp.gsfc.nasa.gov/Education/Imagnet.html
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The N end will repel the N end of another magnet, S will repel S, but N and S attract each other. The region where this is observed is loosely called a magnetic field; a more specific look at the concept of "field" is provided in a later section.
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www-istp.gsfc.nasa.gov/Education/wmfield.html
www-istp.gsfc.nasa.gov/Education/wmfield.html
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Origin of the Magnetic Field ... The Earth has a substantial magnetic field, a fact of some historical importance because of the role of the magnetic compass in exploration of the planet. ... The field lines defining the structure of the magnetic field are similar to those of a simple bar magnet, as illustrated in the...
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csep10.phys.utk.edu/astr161/lect/earth/magnetic.html
csep10.phys.utk.edu/astr161/lect/earth/magnetic.html
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