le
The cloillunk up
es 85) Discovery of magnets has improved the
quality
lives. Explain in about
( our
8-10 lines.
Answers
Explanation:
ple from Ancient Egypt started using magnets to play tricks, by making objects of worship float in mid-air by proper positioning of magnets. Legends have it, the emperor from China used magnets to save his palace by constructing gates made of loadstone. The amours made of metal got attracted to the magnetic gates and prevented them from going any further.
Magnet
In his book, De Magnete (1600), scientist William Gilbert has mentioned techniques of artificially making magnets from steel. He used three techniques by which steel can be magnetized permanently:
Rub the steel needle with a block of loadstone along a particular direction starting from one end and ending at other
Forging powdered iron at high temperature under strong magnetic forces.
Leaving red-hot iron bar to cool in Earth’s magnetic field for twenty years. This method only had a theoretical basis and was not used for the purpose.
In 1820, the concept of electromagnetism was discovered by Hans Christian Orsted, who observed a deflection in the compass needle from magnetic north when the electric current from the battery he was powering his set up with was switched on and off.
Electromagnetism
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1 Comment
hiramani kumari MARCH 7, 2020 AT 8:53 PM
thank you very good word about magnet
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