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Unit 11: Magnetism Page 22
magnets lined up and dropped it. Since they have turned, they now
CRASH! They get all jumbled up act like a magnet and the fridge
and next thing you know the box magnet can now be attracted to
no longer has nearly as strong of a the atoms in the fridge. Once you
magnetic force. remove the fridge magnet, the
atoms in that part of the fridge go
Magnets Are Picky Where They back to being mixed up. Here's
Are Sticky what you do:
“So, how come I can get a magnet 1. Attach a paper clip to your
to stick to a refrigerator but not my magnet.
brother’s head?” Ah, I’m glad to
see that you’re experimenting! 2. Can you dangle another paper
(You might not want to use your clip from the end of your first one?
siblings as test subjects
though...just a thought.) In a way, 3. How many can you dangle from
you could say that magnets only each other. Two, three, four,
stick to other magnets. I know you more?
refrigerator is not a magnet but
4. What happens if you remove the
bear with me for a second. Your
permanent magnet from the top of
fridge is made of a metal that has
the chain?
iron in it.
The paper clips became temporary
Remember that each iron atom is
magnets didn’t they? The
kind of like a little magnet. So your
permanent magnet turned the iron
fridge is made of bunches of little
atoms in the paperclips so that
magnets. The reason you can’t
they aligned with the field of the
stick paper clips to your fridge is
permanent magnet. Since those
that all those little “atom magnets”
atoms are all facing in a similar
are pointing in different directions
direction, they can now create a
and canceling out their magnetic
magnetic field of their own. So the
fields. But what happens when a
paper clip becomes a magnet as
magnetic field gets close to those
long as a magnet is near it. Once
little “atom magnets”? They turn.
the permanent magnet gets too far
The atoms turn so that their poles
away, the atoms go back to mish-
are opposite of the poles of the
mosh and no longer have much of
magnet. (We’ll talk more about
a magnetic field.
poles in a later lesson.)
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