Magnet

A magnet is an object that has a magnetic field. The word magnet comes from the Greek "magnítis líthos" (μαγνήτης λίθος), which means "magnesian stone". Magnesia is an area in Greece (Now Manisa, Turkey) where deposits of magnetite have been discovered since antiquity. Magnet - Introduction. In the modern sense, a magnet is any material that has a magnetic field. It can be in the form of a permanent magnet or an electromagnet. Permanent magnets do not rely upon outside in ...

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Magnet - Characteristics of magnetic materials

Read more here: » Magnet: Encyclopedia - Magnet

Magnet: Encyclopedia - Magnetization Magnetization refers to the property of some materials to generate a magnetic field, either in the presence of an external magnetic field or spontaneously. Magnetization is not always homogeneous within a body, but rather a function of position. A magnetized body creates a demagnetization field that opposed the applied magnetic field. There are different types of magnetism: Magnetization - Diamagnetism. This is the most common magnetic behavior. The diamagnetic magnetization is proportional and oppo ...

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Magnet: Encyclopedia - Magnetism

In physics, magnetism is one of the phenomena by which materials exert an attractive or repulsive force on other materials. Magnetism - Magnetic materials. Some well known materials that exhibit easily detectable magnetic properties are iron, some steels, and the mineral lodestone; however, all materials are influenced to one degree or another by the presence of a magnetic field, although in most cases the influence is too small to detect without special equipment.

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Magnet: Encyclopedia II - Magnet - Physical origin of magnetism

Magnet - Permanent magnets. All normal matter is composed of particles (protons, neutrons, and electrons), and all of these particles have the fundamental property of quantum mechanical spin. Spin gives each one of these particles an associated magnetic field. Because of this, and the fact that the average microscopic piece of matter contains huge numbers of these particles, it would be expected that all matter would be magneti ...

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Ferrite magnet - Uses

Magnet: Encyclopedia - Animal magnetism

Animal magnetism is both a synonym for mesmerism as well as the 18th century term for the supposed ethereal medium postulated by Franz Mesmer as a therapeutic agent. Its existence was examined by a French royal commission in 1784, and the commission concluded there was no evidence of its existence or efficacy of the animal magnetic fluid, and that its effects derived from either the imaginations of its subjects or charlatanry. The term is also occasionally employed in the context of Christian Science to describe unheeded mental influences, maliciou ...

Magnet: Encyclopedia - Magnetic tape

Magnetic tape is a non-volatile storage medium consisting of a magnetic coating on a thin plastic strip. Nearly all recording tape is of this type, whether used for video with a videocassette recorder, audio storage (reel-to-reel tape, compact audio cassette, digital audio tape (DAT), digital linear tape (DLT) and other formats including 8-track cartridges) or general purpose digital data storage using a computer (specialized tape formats, as well as the above-mentioned compact audio cassette, used with home computers of the 1980s, and DAT, used fo ...

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Magnet: Encyclopedia - Magnetic field

In physics, a magnetic field is an entity produced by moving electric charges (electric currents) that exerts a force on other moving charges. (The quantum-mechanical spin of a particle produces magnetic fields and is acted on by them as though it were a current; this accounts for the fields produced by "permanent" ferromagnets.) A magnetic field is a vector field: it associates with every point in space a (pseudo-)vector that may vary in time. The direction of the field is the equilibrium direction of a compass needle placed in the f ...

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Magnet: Encyclopedia - Magnet therapy

Magnet therapy, or magnetic therapy, is a form of alternative medicine based on the claim that certain medical disorders can be effectively treated by exposure to magnetic fields. Some believe that magnetic fields emanating from permanent magnets placed close to the body can cause bones to heal faster, relieve pain, and perform other forms of healing to the body. It is most commonly recommended by practitioners as a cure for joint disorders and back problems. Critics charge that no verifiable evidence has been put forth that magnet therapy has any real benefits, and thus relegate it to the realm of ps ...

Magnet: Encyclopedia - Earth's magnetic field

Earth's magnetic field (and the surface magnetic field) is approximately a magnetic dipole, with one pole near the geographic north pole and the other near the geographic south pole. An imaginary line joining the magnetic poles would be inclined by approximately 11.3° from the planet's axis of rotation. The cause of the field is probably explained by dynamo theory. The magnetic field extends several tens of thousands of kilometres into space as the magnetosphere. Earth's magnetic field - Magnetic poles. Including:

Magnet: Encyclopedia - A Treatise on Electricity and Magnetism

A Treatise on Electriciy and Magnetism is an 1873 textbook on electromagnetism written by James Clerk Maxwell. According to the comprehension of the major trend for the fundamental equations of electromagnetic fields, electromagnetic potential is not explicitly involved. In his original book, the equations are compiled to two sets. The first set is The second set is See also. Maxwell's equations

Magnet: Encyclopedia II - Magnetism - Magnetic dipoles

Normally, magnetic fields are seen as dipoles, having a "South pole" and a "North pole"; terms dating back to the use of magnets as compasses, interacting with the Earth's magnetic field to indicate North and South on the globe. A magnetic field contains energy, and physical systems stabilize into the configuration with the lowest energy. Therefore, when placed in a magnetic field, a magnetic dipole tends to align itself in opposed polarity to that field, thereby canceling the net field strength as much as possible and lowering ...

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Magnet

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