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induction
induction in electricity and magnetism, common name for three distinct phenomena. Electromagnetic induction is the production of an electromotive force (emf) in a conductor as a result of a changing magnetic field about the conductor and is the most important of the three phenomena. It was di...
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magnet
magnet Object that produces a magnetic field, an area around the magnet in which other magnetizable objects experience a force. Lodestones, which are naturally magnetic, were used as early magnets, and strong magnetic materials were later recognized as containing either iron, cobalt, nickel or thei...
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magnetic pole
magnetic pole the two nearly opposite ends of the planet where the earth's magnetic intensity is the greatest, as the north and south magnetic poles. For the magnetic north, it is the direction from any point on the earth's surface linking the horizontal component of the magnetic lines of force wit...
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William Gilbert
William Gilbert 1544-1603, English scientist and physician. He studied medicine at Cambridge (M.D., 1569), where he was elected a Fellow of St. John's College, and set up practice in London, becoming president of the College of Physicians (1599) and court physician to Queen Elizabeth I (1600) and l...
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magnetism
magnetism force of attraction or repulsion between various substances, especially those made of iron and certain other metals; ultimately it is due to the motion of electric charges.
Magnetic Poles, Forces, and Fields
Any object that exhibits magnetic properties is called a magnet. Ever...
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magnetite
magnetite , lustrous black, magnetic mineral, Fe 3 O 4 . It occurs in crystals of the cubic system, in masses, and as a loose sand. It is one of the important ores of iron (magnetic iron ore) and is a common constituent of igneous and metamorphic rocks. It is found in Norway, Sweden, the Urals, and ...
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magnetic resonance
magnetic resonance in physics and chemistry, phenomenon produced by simultaneously applying a steady magnetic field and electromagnetic radiation (usually radio waves) to a sample of atoms and then adjusting the frequency of the radiation and the strength of the magnetic field to produce absorpti...
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magnetic flux
magnetic flux in physics, term used to describe the total amount of magnetic field in a given region. The term flux was chosen because the power of a magnet seems to "flow" out of the magnet at one pole and return at the other pole in a circulating pattern, as suggested by the patterns form...
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geophysics
geophysics study of the structure, composition, and dynamic changes of the earth , its atmosphere , hydrosphere and magnetosphere, based on the principles of physics . The term was probably first used in Germany, where it appeared in scientific writings of the mid-19th cent. Geophysics, which em...
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electromagnet
electromagnet device in which magnetism is produced by an electric current. Any electric current produces a magnetic field, but the field near an ordinary straight conductor is rarely strong enough to be of practical use. A strong field can be produced if an insulated wire is wrapped around a sof...
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