MAGNETISM

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MAGNETISM
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DEFINITION

• MAGNET
• A polarized piece of metal that produces a
  magnetic field which pulls on other materials
  (like iron and other metals). A magnet will also
  attract and repel other magnets

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DEFINITION

• MAGNETIC FIELD
• Magnetic forces create a field with both
  direction and strength

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Magnetic field continued

• STRENGTH Some magnets are more powerful than
  others based on how polarized it is (how shifted
  the electrons are.)Also the force of the
  magnetic field is stronger closer to either of
  the poles.

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Magnetic field continued

• DIRECTION The direction of a magnetic field is
  always from the north pole to the south pole.

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NORTH AND SOUTH POLES

• NORTH POLE
• An absence of electrons results in a positive
  charge at the north pole of a magnet

• SOUTH POLE
• Extra electrons causes the south pole of a magnet
  to have a negative charge

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HOW MAGNETS INTERACT

• 2 TYPES OF MAGNETS
• Bar magnet magnet that is a straight line so
  that the north and south poles point in opposite
  directions, it does not matter how short it is or
  if its a box or cylinder

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2 types continued

• Horse-shoe magnet
• Also called u-magnetand bent-magnet
• These magnets are bent so that both poles of the
  magnet are facing the same direction.

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HOW MAGNETS INTERACT

• OPPOSITE POLES
• OPPOSITES ATTRACT
• LIKE POLES
• LIKE POLES REPEL

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HOW MAGNETS INTERACT

• Please draw the appropriate magnetic fields for
  the following pairs of magnets

NS
S N
N S
N S
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HOW MAGNETS INTERACT

• MAKING NEW MAGNETS
• New magnets are primarily made by rubbing them
  against existing magnets.
• This causes the metallic bonds to become
  polarized because they are being subjected to a
  large charge, either drawing all the electrons
  towards it, or repelling them from it.
• Which pole of a magnet would draw the electrons
  of a metal object toward it? Which would repel
  electrons?

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How magnets interact
N
S
N
S
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HOW MAGNETS INTERACT

• Based on the last picture, what you know about
  electrons and protons, and metallic and polarized
  metallic bonds is it possible to cut a magnet in
  half so that you have only a north pole on one of
  the resulting pieces of metal and only a south
  pole on the other? EXPLAIN