Question

what is the history of magnets

Answer 1

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Answer 2

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Explanation:

TThe history of magnetism dates back to the 600 BCE, where we find mention of Lodestone in the work of Greek philosopher Thales of Miletus. Early lodestone, found in the Greek region of Magnesia, Anatolia is where the modern name “magnet” is derived.

The earliest Chinese reference to “Lodestone” occurs in the 400 BCE in “The Book of the Devil Valley Master.” In this writing, Lushi Chunqiu, from the second century BC stated that Lodestone makes iron come to it or it “attracts” it. By the 12th century, the Chinese were using Lodestone compasses to navigate.

In 1600 English Scientist William Gilbert was the first to investigate magnetism using scientific methods. Gilbert conducted many experiments with his model of the Earth (called the terrella). From his experiments, he argued that the center of the Earth was iron and that the Earth was, in fact, a magnet and this was the reason that compasses point north, and not due to Polaris (the pole star) or a large magnetic island.

Early theoretical investigations into the Earth’s magnetism were studied by Carl Friedrich Gauss.

The modern understanding of the relationship between magnets and electricity began with Hans Christian Orsted in 1819. Orsted, a Professor at the University of Copenhagen, discovered by accident that an electric current could influence a compass needle.

By the 1930s scientists had produced the first Alnico magnet. By 1966 the first Samarium-Cobalt magnets were produced with an energy capable of 18 MGOe and were refined to be able to achieve 30 MGOe by 1972.

In 1983 joint research between General Motors, Sumitomo Special Metals and the Chinese Academy of Sciences developed the first 35 MGOe magnet out of Neodymium, Iron and Boron which also comprise the body of today’s 52 MGOe magnets.he history of magnets begins with the first discoveries of magnetic stones or lodestones – starting from 1845 this kind of stone was called magnetite. It is a mostly black mineral of iron and oxygen or iron hydroxide, which develops in a natural way by volcanic activity and has its own magnetic property.