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Timeline of Magnetism.pptx

  1. Timeline of Magnetism Group 3
  2. Ancient World: Magnetism is know to the ancient Greeks, Romans, and Chinese. The Chinese used geomantic compasses in Feng Shui. Magnets gained their name from Manisa in Turkey, a place once named Magnesia, where magnetic lodestone was found in the ground
  3. Geomantic compass
  4. 13th century: Petrus Perigrinus Magnetic compasses were first used for navigation in western nations. Frenchman Petrus Perigrinus, also called Pierre de Maricourt, mapped the magnetic field of a lodestone with a compass and discovered that a magnet had two magnetic poles: north and south poles.
  5. Compass
  6. 17TH Century: William Gilbert English physician and scientist William Gilbert (1544-1603), physician of Queen Elizabeth I, published De Magnete (On Magnets) in 1600, his monumental scientific study of magnetism, and proposed that Earth is a giant magnet.
  7. 18th Century: John Michell and Charles Augustin de Coulomb Englishman John Michell (1724-93) and Frenchman Charles Augustin de Coulomb (1736-1806) studied the forces magnets can exert. Coulomb also made important studies of electricity, but failed to connect electricity and magnetism as parts of the same underlying phenomenon.
  8. Torsion Balance
  9. John Michell Charles Augustin de Coulomb
  10. 19th Century Danishman Hans Christian Oersted (1777-1851), Frenchmen André- Marie Ampère (1775-1836) and Dominique Arago (1786-1853), and Englishman Michael Faraday (1791- 1867) explored the close connections between electricity and magnetism.
  11. Andre-Marie Ampere Dominique Arago
  12. Hans Christian Oersted Oersted arrived to this conclusion after discovering that an electric current flowing through a wire can cause a compass needle to deflect.
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  14. Joseph Henry and Micheal Faraday Faraday and American Joseph Henry (1797-1878) independently discovered that a changing magnetic field produced a current in a coil of wire Faraday, who was perhaps the greatest experimentalist of all time, came up with the idea of electric and magnetic "fields" and invented the dynamo (a generator), along with one of the first electric motors.
  15. Micheal Faraday Joseph Henry
  16. EXAMPLE:
  17. James Clerk Maxwell James Clerk Maxwell (1831- 1879) published a relatively complete explanation of electricity and magnetism (called the theory of electromagnetism) and suggested that electromagnetic energy travels in waves
  18. visualize
  19. Pierre Curie Pierre Curie (1859-1906) demonstrated that materials lose their magnetism above a certain temperature now known as Curie point
  20. visualize
  21. Wilhelm Weber Wilhelm Weber (1804- 1891) developed practical methods for detecting and measuring the strength of a magnetic field.