5. Magnetization of materials varies to
the kind of materials a permanent magnet
or current is in contact with. There are
objects that we called magnetizable or
non-magnetizable. Magnetizable objects
are objects that can possess magnetic
abilities.
6. This happen when they adapt the
ability of a magnet to magnetize other
objects. The positive and negative
polarities of the objects realign due to
excitation of the charges that follows
the magnetic field of a magnetizable
material.
7. On the other hand non-
magnetizable objects are those
objects that does not possess the
ability to magnetize other objects.
Common example of magnetizable
objects are metals and metalloids.
While plastic and other liquid
elements are non-magnetizable
objects.
8. The process by which a
magnetic substance attains
magnetism or exhibit magnetic
properties either temporarily or
permanently is what we called
magnetization.
9. On the other hand, the process
of removing or eradicating the
magnetic property of a magnet is
what we called demagnetization.
There are ways to magnetize or
demagnetize a permanent magnets.
10. For an object to attain magnetization,
the following procedures or methods are
done. These processes are:
• Single Touch Method
• Double Touch Method
• Electrical Method
11. Single Touch Method
Single touch method is done
by rubbing a magnet along a
magnetic substance from one
end to another and lifting the
magnet vertically upwards
when it reaches the end,
rubbing both upper and lower
surface.
12. Double Touch Method
It is a process wherein two magnets are
placed with each other at the center of
the magnetic material and rubbed in
opposite direction.
14. There are also ways to demagnetize or to
remove the magnetic property of a magnetic
material. To destroy or to lose totally or partially
the magnetism of a magnet, the following are
some ways to do it:
15. Rough Handling
It is handling the magnetic
materials carelessly like hammering
or dropping the magnet
https://www.google.
com.ph/search?q=ha
mmering+a+magnet
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https://www.google.com.ph/search?q=losing+magn
etism&tbm=isch&ved=2ahUKEwiCw6n70v_pAhUBgp
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17. Induction
Placing magnet side by
side with similar poles
together induces polarity
with each other, causing
demagnetization. To avoid
self demagnetization,
magnets are placed side
by side with their opposite
poles.
https://www.google.com.ph/search?q=proper+storing+of+magnets&tbm=isch&ved=2ahUKEwjDyLXt3P_
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18. Passing Electricity
Magnets loses its
magnetization as current
changes direction
continuously. This
change in the direction of
the current disturbs the
alignment of molecular
magnets resulting to
demagnetization.
https://www.google.com.ph/search?q=demagnetisation+by+heating&tbm=isch&ved=2ahUKEwil5JG43__p
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GB#imgrc=lmEZ96DRZE9KCM&imgdii=jbED53teOo3OhM
20. Let us conduct a simple experiment. In this
experiment we will need:
Magnet Iron filings in
a bottle
Compass
21. Procedure:
1.Put iron filings in a sheet of paper and
check whether the iron filings are
magnetized or not. To unmagnetized the
filings, stir or move the iron filings gently
on the paper and check it again until it
unmagnetized.
22. 2.When the iron filings are ready, placed it
on a test tube or a small bottle. Fill the
quarter portion of the bottle and cover it
using a tape or cork to secure the iron
filings from spilling out.
23. 3. Hold the test tube horizontally. Shake or
roll the test tube or bottle gently with your
fingers to level out the iron filings inside.
24. 4. Then when levelled, touch the bottle or
test tube with the north pole end of the
permanent magnet the test tube’s end as
shown in a video clip on the next slide.
25. Move the magnet along
the test tube from this end
to the covered end. Lift
the magnet off the test
tube and repeat with ten
or more strokes. Observe
and record what happens
inside the test tube.
26. 5. Gently lay the test
tube on a table and
bring compasses near
both ends of the test
tube as shown below.
Observe and record
what happens.
27. 6. Carefully shake the test
tube as shown below
without moving the
compasses. Place the test
tube once again in line with
the compass and check the
magnetism of the filings.
Record your observation
28. In the video we observe the behavior
of the iron filings in the bottle when a
magnet is placed and stroked under it.
Magnetization by stroking can only be
possible if the object being stroked
possess magnetic properties.
29. In our video the iron filings become
a temporary magnet. Each molecules
realigned its positive and negative
polarities when it was under the
influence of the magnetic field of the
magnet. As long as it is being
influenced by the magnetic field, it will
exhibit the properties of being a
magnet.
30. But when put away the magnet and
shake the bottle that contains the
magnetized iron filings, it will return to
its normal state. That is because there
are no magnetic field that excites the
positive and negative polarities of the
iron filings so these charge will be
suspended inside the bottle.
31. THANK YOU AND
GOD BLESS!
Prepared by:
RICHMOND DV. BATAZAR
LPT, SCIENCE 1O
