Magnetism
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History of Magnetism
- The first known magnets were naturally occurring lodestones, a type of iron ore called magnetite (Fe3O4). People of ancient Greece and China discovered that a lodestone would always align itself in a
- longitudinal direction if it was allowed to rotate freely. This property of lodestones allowed for the creation of compasses two thousand years ago, which was the first known use of the magnet.
- In 1263 Pierre de Maricourt mapped the magnetic field of a lodestone with a compass. He discovered that a magnet had two magnetic poles North and South poles.
- In the 1600′s William Gilbert, physician of Queen Elizabeth I, concluded that Earth itself is a giant magnet.
- In 1820 the Danish physicist Hans Christian Ørsted discovered an electric current flowing through a wire can cause a compass needle to deflect, showing that magnetism and electricity were related.
Content of Magnetism PPT:
- History of Magnetism
- Bar Magnets
- Magnetic Dipoles
- Magnetic Fields
- Magnetic Forces on Moving Charges and Wires
- Electric Motors
- Current Loops and Electromagnets
- Solenoids
- and more
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Tags: danish physicist, electromagnets, history of magnetism, lodestones, longitudinal direction, magnetic forces, magnetism and electricity, queen elizabeth, solenoids, william gilbert