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Magnetism.pptx
1.
2. MECHANICS:
1. Each team will be given envelopes with
cutouts.
2. Each team has to arrange the cutouts to
form pictures.
3. You are given 5 minutes to accomplish
the activity.
3. 4. The fastest group to accomplish the
task will be given an extra 2 points.
Completing the task within the given
time is equivalent to 5 points.
4.
5. HANS CHRISTIAN OERSTED
A professor in
Denmark who
discovered in
1820 that a
current carrying
wire produces a
magnetic field.
8. JAMES CLARK MAXWELL
A Scottish Physicist
who formulated the
Theory of
Electromagnetism,
which showed that
light was
electromagnetic
induction.
9. The Greek philosopher
named THALES, who lived
during the sixth century
B.C., is said to have been
the first to observed the
property of lodestone
which attracts iron.
10. ALNICO is also a natural
magnet that are primarily
made up of a combination
of Aluminum, nickel and
cobalt. This natural magnet
is used on electric motors,
microphones, sensors and
aerospace applications.
13. Tale of Magnes
There was a shepherd named Magnes.
One day when he was tending his flock
of sheep on the slopes of Mount Ida in
Asia Minor, he noticed that the iron tip of
his stick was being pulled toward the
ground.
14. Tale of Magnes
He dug up the ground and found out
that the large deposit of lodestone was
attracting his stick. Thereafter the
lodestone was called magnet in honor of
the shepherd who had discovered it, and
later was called magnetite.
15. ACTIVITY NO. 1
PHYSICS CHALLENGE
Electromagnet - a temporary magnet made
of a piece of metal with coil to which an
electric current passes through.
Coil - a series of loops around an object.
20. 1. Moving the magnet into or out of
the coil, caused the bulb to light
during the movement. The bulb does
not light when the magnet was at
rest relative to the coil.
21. 2. There will be more electricity
when there is greater number of
turns in the coil.
22. 3. The bulbs light becomes
brighter when the magnet is
moved into or out of the coil at a
faster speed causing a greater
rate of change in magnetic field
strength.
23. 4. When the magnet was moved
parallel or along the coil, the bulb
barely lights. The light becomes
brighter when the magnet was
moved perpendicular or across
the coil.
24. 5. The stronger the magnet, the
brighter the light of the bulb.
25. What is the significance of
electromagnetic induction?
26. It is a way of producing electrical
energy in a circuilt by using
magnetic fields and not just
batteries.
27. Where can we use and
see electromagnets
and electromagnetic
induction?
An electromagnet is a temporary magnet that runs through electricity. An electromagnet works because an electric current produces a magnetic field.
The mechanical energy of the moving magnet is converted into electricity, because a moving magnetic field , entering a conductor causes current to flow in the condutor.
