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Magnetism• property of matter in which there is a
force of attraction or repulsion b/w like or unlike poles
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What do we know about magnets?
• 2 Magnetically opposite poles:– North Pole and South Pole
• Like poles repel and Opposite poles attract– “We’ll get back to this later”
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What types of things do magnets attract?
• “Do magnets attract all metals?”– Magnets only attract objects made of iron, cobalt,
or nickel!! • These metals are called the “Iron Triad”
– See Periodic Table
• You can also only make a magnet out of these 3 metals.
• Those “rubber” magnets have iron, cobalt or nickel in them.
1st
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Magnetic Domains• The molecules of most
substances have no orientation to them.
• In a magnet, the molecules align themselves in a very specific pattern.
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I wonder why?
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Magnetic Field• Surrounding all magnets is a magnetic
field.• Magnetic Field is the area surrounding a
magnet where the magnetic force acts.
Magnetic Field
Lines
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Magnetic Field Lines
Magnetic Field Lines always move out of the North pole and
into the South pole!!
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What makes the North Pole the North Pole and the South Pole the South Pole?
It is not the N
and S stamped on them!!!!
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The North Pole is the pole that the magnetic field lines move out of.The South Pole is the pole that the magnetic field lines move into.
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Magnetic Field Lines• Magnetic Field lines always move out of
the North end and into the South end!!
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Magnetic Field Lines of Interacting Magnets
Lines of Repulsion Lines of Attraction
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Solving for Unknown Poles
Are the field lines attracting or repelling?North ____________ what?attracts
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Solving for Unknown Poles
Are the field lines attracting or repelling?North __attracts______ what?
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Solving for Unknown Poles
Are the field lines attracting or repelling?North ____________ what?repels
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Solving for Unknown Poles
Are the field lines attracting or repelling?North __repels____ what?
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Determine the unknown pole
A. North
B. South
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Determine the unknown pole
A. North
B. South
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Where are Magnets the strongest?
I wise man told me many years ago that
“Magnets are strongest at the poles”. That is
where the magnetic field lines are the
most concentrated.
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Which of the following metals would not make a very good magnet?
A. IronB. CobaltC. AluminumD. Nickel
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Mr. Garay
What happens if you break a bar magnet in half?
You get 2 bar magnets both with
a North and a South pole!!
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Breaking a Bar Magnet
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Where is this magnet the strongest?
A. 1 only
B. 2 only
C. 3 only
D. 1 and 3
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Where is this magnet the strongest?
A. 1 only
B. 2 only
C. 3 only
D. 1 and 2
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If you broke a bar magnet in half and then broke both halves in half again, how many bar magnets would you have?
A. Not possibleB. 2C. 4D. 8
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Note-taking Skills Worksheet
• A. Magnetism—the properties and interactions of magnets.– 1.Interaction b/w 2 magnets, called
magnetic force, increases as magnets move closer together.
– 2. A magnetic field, which exerts the magnetic force, surrounds a magnet, and is closest to the magnet.
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Note-taking(cont.)
• B. Magnetic Poles—the region of a magnet where the magnetic force exerted by the magnet is strongest.– 1. All magnets have a north and a south pole.– 2. Like poles repel. Unlike poles attract.– 3. Earth has magnetic poles.
• A) A compass needle is a small bar magnet that can freely rotate.
• B) A compass needle always points north.
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Note-taking(cont.)
• C. Magnetic materials—iron, cobalt, and nickel– 1. The magnetic field created by each atom exerts
a force on nearby atoms.– 2. Magnetic domains—groups of atoms with
aligned magnetic poles.• A) In a magnet, the like poles of all the domains point in
the same direction.• B) Permanent magnets are made by placing a magnetic
material in a strong magnetic field, forcing a large number of magnetic domains to line up.
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Any
Questi
ons?
?