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Exploring Magnetism: Magnets and Magnetic Fields Through Time

Delve into the world of magnetism over 2,000 years ago when Greeks discovered natural magnets like magnetite. Learn about permanent and soft magnets, magnetic fields, poles, and how Earth's magnetic field interacts with compasses, all through time.

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Exploring Magnetism: Magnets and Magnetic Fields Through Time

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  1. Chapter 17Magnetism Magnets and Magnetic Fields

  2. Magnets • 2,000 years ago Greeks discovered deposits of a mineral that was a natural magnet • Magnetite or loadstone

  3. Magnetism • Magnetism refers to the properties and interactions of magnets

  4. Magnets • Permanent magnet - Magnetic all the time • Hard – hard to magnetize but stays • Soft – easily magnetized but loses

  5. Magnetic Field • Magnetic field -exerts a force on other magnets and objects made of magnetic materials • Strongest close to the magnet and weaker far away

  6. Magnetic Poles • Magnetic poles - where the magnetic force exerted by the magnet is strongest • North and South Pole • Bar magnet - the north and south poles are at the opposite ends

  7. Magnetic Poles • Magnetic field lines always connect the north pole and the south pole of a magnet

  8. Magnetic Field Direction • When a compass is brought near a bar magnet, the compass needle rotates • Needle rotates until it lines up with the magnetic field lines

  9. Earth’s Magnetic Field • Earth acts like a giant bar magnet and is surrounded by a magnetic field that extends into space

  10. Earth’s Magnetic Poles • Earth’s south magnetic pole - northern Canada about 1,500 km from the geographic north pole

  11. Earth’s Magnetic Poles • Earth’s magnetic poles move slowly with time • Earth’s magnetic poles switch places

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