Download presentation
Presentation is loading. Please wait.
Published byElfreda Long Modified over 8 years ago
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 Earth’s 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
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.