Magnetism - définition. Qu'est-ce que Magnetism
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Qu'est-ce (qui) est Magnetism - définition

CLASS OF PHYSICAL PHENOMENA
Magnetic; Magnetic ordering; Nonmagnetic; Magnetically; Magneticism; Magnetics; Repulsive force (magnetism); Magnetize; Magnetisim; Magneticist; Non-magnetic; Magnetic attraction; Magnetic properties; Magnetic property; Speed of magnetism; Repulsion (magnetism); Magnetic studies; Magnetised; Magnetized
  • Drawing of a medical treatment using magnetic brushes. [[Charles Jacque]] 1843, France.
  • Antiferromagnetic ordering
  • An illustration from Gilbert's 1600 ''De Magnete'' showing one of the earliest methods of making a magnet. A blacksmith holds a piece of red-hot iron in a north–south direction and hammers it as it cools. The magnetic field of the Earth aligns the domains, leaving the iron a weak magnet.
  • An electromagnet attracts paper clips when current is applied creating a magnetic field. The electromagnet loses them when current and magnetic field are removed.
  • [[Ferrimagnetic]] ordering
  • [[Ferrofluid]] "spiked" up by a cube [[neodymium magnet]], following its [[magnetic field]]
  • teslas]]
  • [[Lodestone]], a natural [[magnet]], attracting iron nails. Ancient humans discovered the property of magnetism from lodestone.
  • Detecting magnetic field with compass and with iron filings
  • Magnetic orders: comparison between ferro, antiferro and ferrimagnetism
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Magnetism         
·noun The science which treats of magnetic phenomena.
II. Magnetism ·noun Power of attraction; power to excite the feelings and to gain the affections.
III. Magnetism ·noun The property, quality, or state, of being magnetic; the manifestation of the force in nature which is seen in a magnet.
magnetism         
n. animal; personal; physical magnetism
magnetism         
n.
Power of attraction.

Wikipédia

Magnetism

Magnetism is the class of physical attributes that are mediated by a magnetic field, which refers to the capacity to induce attractive and repulsive phenomena in other entities. Electric currents and the magnetic moments of elementary particles giving rise to a magnetic field, which acts on other currents and magnetic moments. Magnetism is one aspect of the combined phenomena of electromagnetism. The most familiar effects occur in ferromagnetic materials, which are strongly attracted by magnetic fields and can be magnetized to become permanent magnets, producing magnetic fields themselves. Demagnetizing a magnet is also possible. Only a few substances are ferromagnetic; the most common ones are iron, cobalt, and nickel and their alloys. The rare-earth metals neodymium and samarium are less common examples. The prefix ferro- refers to iron because permanent magnetism was first observed in lodestone, a form of natural iron ore called magnetite, Fe3O4.

All substances exhibit some type of magnetism. Magnetic materials are classified according to their bulk susceptibility. Ferromagnetism is responsible for most of the effects of magnetism encountered in everyday life, but there are actually several types of magnetism. Paramagnetic substances, such as aluminium and oxygen, are weakly attracted to an applied magnetic field; diamagnetic substances, such as copper and carbon, are weakly repelled; while antiferromagnetic materials, such as chromium and spin glasses, have a more complex relationship with a magnetic field. The force of a magnet on paramagnetic, diamagnetic, and antiferromagnetic materials is usually too weak to be felt and can be detected only by laboratory instruments, so in everyday life, these substances are often described as non-magnetic.

The magnetic state (or magnetic phase) of a material depends on temperature, pressure, and the applied magnetic field. A material may exhibit more than one form of magnetism as these variables change.

The strength of a magnetic field almost always decreases with distance, though the exact mathematical relationship between strength and distance varies. Different configurations of magnetic moments and electric currents can result in complicated magnetic fields.

Only magnetic dipoles have been observed although some theories predict the existence of magnetic monopoles.

Exemples du corpus de texte pour Magnetism
1. It makes it possible to successfully find out not only minerals with strong magnetism but also magnetism–less or magnetism–poor minerals.
2. Consider the magnetism of that naughty red sandwich.
3. The one word that comes to your mind when you say his name is sheer magnetism.
4. Benjamin Franklin was in correspondence with Russian scientists about his theories of electricity and magnetism.
5. He possesses the magnetism, aptitude and power to control the workings of the city.