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Intro to magnetics

Earth’s Magnetic Field. Intro to magnetics. Magnetic history. A mineral called magnetite was discovered that attracted other pieces of certain metals. They noticed that these pieces when rubbed against small pieces of iron would cause those pieces to become magnetized ! b.

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Intro to magnetics

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  1. Earth’s Magnetic Field Intro to magnetics

  2. Magnetic history • A mineral called magnetite was discovered that attracted other pieces of certain metals. • They noticed that these pieces when rubbed against small pieces of iron would cause those pieces to become magnetized! b

  3. Why was this important? • Before magnets, sailors would have to use the stars in the sky to navigate • Once they found out that certain metals could be magnetized they put them in compasses. An old compass used for navigation Why did that work? What do the compasses point to? Why?

  4. Basic Magnets Magnets • A magnet: is any substance that can attract iron or other magnetic material! • Metals attracted to a magnet: • Iron, Nickel, Cobalt • Metals not attracted to a magnet: • Gold, Copper, Brass, Aluminum • Naturally occurring magnetic rocks are called: Lodestones

  5. Magnetic Attraction • Every magnet has two ends. • These ends are called---------------poles • One end is the north pole and the other is the south pole. • The north pole of a magnet is attracted to the south pole of a magnet.

  6. Magnetic Repulsion • North and south attract toeach other but…. • North and North repel • South and South repel • Repel means to push away. N Attract S N Attract S N Repel S S Repel N N Repel S S Repel N

  7. Magnetic Fields • If you hold magnetics you know that they can attract or repel without touching each other. • This is because they create a magnetic field. • Magnetic fields are regions of magnetic force around a magnet.

  8. More Magnetic Fields • Draw these magnetic fields in your notes: N N S S N S

  9. How do magnetic fields work? • Electrons in an atom spin. Moving electrons produce a magnetic field. (book page 304 figure 4) • This makes each atom a tiny magnet. • In most materials these fields point in random directions. • But, if a cluster of billions of atoms that have magnetic fields that are lined up in the same way it is called a Domain.

  10. How do magnetic fields work? • Images to help explain magnetic fields Domains Electrons

  11. Magnetic Domains • These domain parts of a magnetic can line up to all have the same charges face the same direction. • This is why some materials like a paper clip can be magnetized.

  12. Note Quiz • What do north poles of magnets attract, what do they repel? • What is the definition of a magnetic field? • Draw a diagram of a magnetic domain? You are allowed to use your notes. Make sure all answers are on a half sheet of paper and your name is in the upper right hand corner of the sheet.

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