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Title:

Magnetism

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Magnetism * Natural Magnets ... The true test for determining if something is a magnet is repulsion. A Designer Floating Bed The Earth s Magnetic Field The Earth ... – PowerPoint PPT presentation

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Title: Magnetism


1
Magnetism
2
Natural Magnets
  • Natural magnets like lodestone, are found in
    nature

3
Artificial Magnets
  • Artificial or man made magnets are made by
    magnetising
  • Iron
  • Nickel
  • Cobalt
  • Alloys of the above

4
The Poles
  • Magnets are strongest at their 2 ends called the
    north pole and the south pole.
  • Like Poles Repel and Unlike Poles Attract.

5
Unike Poles Attract
6
Like Poles Repel
7
How to Test if Something is a Magnet?
  • The true test for determining if something is a
    magnet is repulsion.

8
A Designer Floating Bed
9
The Earths Magnetic Field
  • The Earth behaves as if there is a huge bar
    magnet in its centre giving it a magnetic field.

10
What is a Magnetic Field?
  • A magnetic field is the space around a magnet
    over which it has a magnetic effect.

11
How a Compass works?
  • A freely suspended magnet always comes to rest
    with one end pointing I a northerly direction.

12
A Compass
  • A compass contains a freely suspended magnet
    which reacts to the magnetic field of the Earth.

13
Electricity and Magnetism
  • Electricity can make a magnet and a magnet can be
    used to create electricity.

14
A wire with a current flowing through it has a
magnetic field around it.
15
An Electromagnet
  • An electromagnet only is a magnet when current
    flows through its coil.

16
Uses of Magnets
  • Electric Motors
  • Electric Bells
  • Bicycle Dynamo
  • Transformers
  • Loudspeakers
  • CTRs
  • Computers
  • Phones
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