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@magneticgamesIT

Italia Katılım Haziran 2017
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Scientists measure the strength of magnetic force of a material in the unit Tesla (named after Nikola Tesla).
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It is possible to remove the magnetism from iron by heating it up. To remove iron's magnetic properties heat it to 1500 degrees Fahrenheit (815 degrees Celsius). Removal of magnetism is useful for some machines.
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Naturally magnetic lodestones were found in an area of Greece called Magnesia
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In the 1100s Lodestones are used for navigation
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In 1269 Petus de Maricourt discovers that magnets have two poles.
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In 1600 William Gilbert discovers Earth's magnetism and magnetic poles
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In 1820 Hans Christian Oersted discovers that wire carrying an electrical current creates a magnetic field
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In the late 1800s, William Thompson (Lord Kelvin), created the most accurate compass for the time. It was a liquid compass where alcohol was used for the liquid so it would not freeze. The magnetic needle was magnetised by a lodestone.
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In 1930 the Japanese discover the material ferrite which is a compound containing ceramic material and iron. Ferrite is used to make a strong permanent magnet.
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