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Transcript
Magnetism Natural Magnets Natural magnets like lodestone, are found in nature Artificial Magnets Artificial or man made magnets are made by magnetising: »Iron »Nickel »Cobalt »Alloys of the above The Poles Magnets are strongest at their 2 ends called the “north pole” and the “south pole”. Like Poles Repel and Unlike Poles Attract. Unike Poles Attract Like Poles Repel How to Test if Something is a Magnet? The true test for determining if something is a magnet is repulsion. A Designer Floating Bed The Earth’s Magnetic Field The Earth behaves as if there is a huge bar magnet in its centre giving it a magnetic field. What is a Magnetic Field? A magnetic field is the space around a magnet over which it has a magnetic effect. How a Compass works? A freely suspended magnet always comes to rest with one end pointing I a northerly direction. A Compass A compass contains a freely suspended magnet which reacts to the magnetic field of the Earth. Electricity and Magnetism Electricity can make a magnet and a magnet can be used to create electricity. A wire with a current flowing through it has a magnetic field around it. An Electromagnet An electromagnet only is a magnet when current flows through its coil. Uses of Magnets Electric Motors Electric Bells Bicycle Dynamo Transformers Loudspeakers CTRs Computers Phones Complete the following in your answerbook: Like poles ___________, unlike poles ___________ List two uses of magnets. What is a compass and how does it work? What is a space around a magnet called? Draw a diagram of a bar magnet and sketch some magnetic field lines around it. Show by means of arrows the directions of the lines of force.
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