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Magnetism

Magnetism. Force of attraction or repulsion of a magnetic material due to the arrangement of its atoms. Properties of Magnets. Magnets have magnetic poles Magnets have magnetic forces 3. Magnets have magnetic fields. Magnetic Force.

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Magnetism

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  1. Magnetism Force of attraction or repulsion of a magnetic material due to the arrangement of its atoms

  2. Properties of Magnets • Magnets have magnetic poles • Magnets have magnetic forces 3. Magnets have magnetic fields

  3. Magnetic Force • The force of attraction or repulsion between magnets.

  4. All magnets have two poles:North and South The Law of Magnetic Poles states that like poles repel and unlike poles attract

  5. Magnetic Field • A region around a magnet in which magnetic forces can be felt. • The closer the lines of force, the stronger the magnet

  6. Magnetic Field

  7. Domains • Groups of atoms in tiny areas within the magnet that are aligned (lined up).

  8. Losing Alignment 1. Dropping a magnet 2. Banging a magnet 3. Heating a magnet

  9. Magnetic Substance One that can be made into a magnet or is attracted to a magnet (i.e. iron, nickel or cobalt) Iron Magnets Cobalt Magnets Nickel Magnets

  10. Kinds of Magnets • Temporary Magnets – easy to magnetize and easy to lose its magnetism • Permanent Magnets – difficult to magnetize, but stay magnetized

  11. Two Types of Magnets • Natural Magnets – found in nature (Magnetite) • Artificial Magnets – made by man Temporary- can be turned on or off (electromagnets) 2. Permanent – cannot be turned on and off

  12. Hans Oersted • Found that when electrons flowed through a wire, a nearby compass needle moved. This showed us that there is a magnetic field around a wire carrying electricity. Using this principle we now have electromagnets Simple to Complex

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