Introduction to Magnets: Origins and Properties
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Questions and Answers

What are the two properties possessed by lodestone?

  • It attracts large pieces of iron and sets itself along a definite direction
  • It attracts small pieces of iron and sets itself along a definite direction (correct)
  • It repels small pieces of iron and sets itself along a definite direction
  • It attracts small pieces of iron and moves randomly

    • What is the origin of the word 'magnet'?

  • From the Latin word for iron oxide
  • From the Greek word for natural magnet
  • From the Chinese word for lodestone
  • From the place 'Magnesia' where the ore was found (correct)

    • Why are artificial magnets prepared from iron?

  • Because iron is stronger than natural magnets
  • Because iron is naturally magnetic
  • Because iron is the only metal that can be magnetized
  • Because iron is easily available and can be shaped conveniently (correct)

    • What happens when a freely suspended magnet is allowed to rotate in a horizontal plane?

    <p>It always points in the geographic north-south direction</p> Signup and view all the answers

    What is the polarity named when an end of the magnet rests in the geographic north direction?

    <p>North polarity</p> Signup and view all the answers

    What happens when two like poles of magnets are brought close to each other?

    <p>They repel each other</p> Signup and view all the answers

    Why were natural magnets found to be inadequate for use?

    <p>They were not magnetically strong enough for use</p> Signup and view all the answers

    How did the Chinese use pieces of lodestone earlier than 2500 B.C.?

    <p>To guide their boats</p> Signup and view all the answers

    What ore was used to make the first known magnets?

    <p>Iron oxide (Fe3O4)</p> Signup and view all the answers

    What are artificial magnets prepared from?

    <p>Iron</p> Signup and view all the answers

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