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1. MagnetismMagnetism

2. What is magnetism?What is magnetism?
 Magnetism is the force of attractionMagnetism is the force of attraction
between magnets and magneticbetween magnets and magnetic
objects.objects.

3. Characteristics ofCharacteristics of
MagnetsMagnets
 All magnets have aAll magnets have a
North and a SouthNorth and a South
Pole.Pole.
 All magnets have aAll magnets have a
magnetic fieldmagnetic field aroundaround
them.them.
 TheThe magnetic fieldmagnetic field is ais a
line of force runningline of force running
from the north-seekingfrom the north-seeking
pole to the south-pole to the south-
seeking pole of theseeking pole of the
magnet.magnet.

4. Earth’s PolesEarth’s Poles
 In our planet we have the North and SouthIn our planet we have the North and South
Poles.Poles.
 Earth acts like aEarth acts like a giant magnetgiant magnet and isand is
surrounded by asurrounded by a magnetic fieldmagnetic field..
 Earth’sEarth’s magnetic fieldmagnetic field is what causes theis what causes the
needle of a compass to point in differentneedle of a compass to point in different
directions and causes the poles of adirections and causes the poles of a
magnet to point either North or South.magnet to point either North or South.

5. Attractive Magnets!!!Attractive Magnets!!!
 The north and south poles of twoThe north and south poles of two
magnets attract each other. Theymagnets attract each other. They
always need to be opposite poles toalways need to be opposite poles to
be attracted.be attracted.
 The magnetic force pulls themThe magnetic force pulls them
together.together.

6.  Magnets of the same pole will repelMagnets of the same pole will repel
each other, either two north or two southeach other, either two north or two south
poles.poles.

7. Magnets and electricityMagnets and electricity
 Magnetic fields can be created withMagnetic fields can be created with
batteries, bolts and wire.batteries, bolts and wire.

8. Magnets and ElectricityMagnets and Electricity
 Electricity and magnetism areElectricity and magnetism are
related:related:
1.1. An electric current produces aAn electric current produces a
magnetic field.magnetic field.
2.2. A change in a magnetic field canA change in a magnetic field can
produce an electric current.produce an electric current.

9. Magnets and ElectricityMagnets and Electricity
 The strength of an electromagnetThe strength of an electromagnet
can be increased by:can be increased by:
1.1. Increasing the number of coils.Increasing the number of coils.
2.2. Increasing the voltage of the current.Increasing the voltage of the current.

10. Magnets and ElectricityMagnets and Electricity
 Electromagnets are used in everyElectromagnets are used in every
day life:day life:
1.1. In telephones, electric motors,In telephones, electric motors,
generators, televisions, door bells.generators, televisions, door bells.
2.2. You can see a huge electromagnetYou can see a huge electromagnet
in action in a junkyard. A cranein action in a junkyard. A crane
holding the electromagnet can beholding the electromagnet can be
used to pick up metal pieces whenused to pick up metal pieces when
current flows through it. When thecurrent flows through it. When the

12. How many
poles do
magnets
have?

13. What happens
when two
magnets of
different poles
are put close
together?

14. What happens
when two
magnets with
same poles
are put close
together?

15. What is the
area of a
magnetic
force called?

16. Electric current
creates a
_____________ field.magnetic

17. What do you make if you
put together a closed
circuit and wrap the wire
around an iron bolt?
Electromagnet

18. How can you make
an electromagnet
stronger?
You can wrap the
wire around the iron
bolt more times.