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Magnets
N S
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Mmagnetism : Magnetic?
Which of the metals below are magnetic metals?
Silver (Ag)
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What is a magnetic Field ?
NS
The iron filings locate the magnetic field and show the
direction of the forces in this region.
The region around a
magnet where it has
a magnetic effect is
called its magnetic
field.
If you put a
magnetic material in
that field it will
experience a force.
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Magnetic Fields - Experiments
Put the north poles of two bar magnets together.
What happens?
Now put the two magnets under a piece of paper
with the N poles together.
Carefully scatter iron filings on the paper.
Draw what you see.
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Magnetic field pattern with N and S poles
together
NNS S
Notice the pattern of lines of force in this region.
How are they different from before?
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SN
Stroke a steel knitting needle with a magnet as indicated in the sketch. Do this at least 20 times – using the same motion. The needle will become magnetic and will keep its magnetism.
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Electromagnetism : Magnetic Fields
What does the magnetic field around a current
carrying coil [solenoid] look like?
Using an iron nail as a solenoid investigate the properties of the
magnetic field.
Keeping the current the same, investigate how many paper clips the
solenoid will support as the number of coils is varied.
Then, keeping the number of coils of wire the same, investigate how
many paper clips the solenoid will support as the current is varied.
Record your results in the tables following:
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Electromagnetism : Electromagnets
Current [A]Number of paper
clips attracted
0
Remember - keep the number of coils the same!
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Electromagnetism : Electromagnets
How the current affects the strength
of an electromagnet
-10
0
10
20
30
40
50
60
70
0 1 2 3 4 5
Current [A]
Nu
mber
of
clip
s attra
cted
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Electromagnetism : Electromagnets
We use large electromagnets in scrap yards to
pick up scrap metal:
What metals would the
electromagnet attract?
What advantages does
an electromagnet have
over a permanent
magnet?
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Electromagnetism : Electromagnets
Lifts, cars and other large electrical machines use
high currents.
A relay can be used to allow a low current circuit to
turn a large current circuit on.
Hi -
This is a SAMPLE presentation only.
My FULL presentations, which contain loads more slides (with all the gaps filled in) as well as
other resources, are freely available on my resource sharing website:
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Have a look and enjoy!
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