2What is magnetism?Magnetism is the force of attraction between magnets and magnetic objects.
3Characteristics of Magnets All magnets have a North and a South Pole.All magnets have a magnetic field around them.The magnetic field is a line of force running from the north-seeking pole to the south-seeking pole of the magnet.
4Earth’s Poles In our planet we have the North and South Poles. Earth acts like a giant magnet and is surrounded by a magnetic field.Earth’s magnetic field is what causes the needle of a compass to point in different directions and causes the poles of a magnet to point either North or South.
5Attractive Magnets!!!The north and south poles of two magnets attract each other. They always need to be opposite poles to be attracted.The magnetic force pulls them together.
6Magnets of the same pole will repel each other, either two north or two south poles. NOT ATTRACTED
7Magnets and electricity Magnetic fields can be created with batteries, bolts and wire.
8Magnets and Electricity Electricity and magnetism are related:An electric current produces a magnetic field.A change in a magnetic field can produce an electric current.
9Magnets and Electricity The strength of an electromagnet can be increased by:Increasing the number of coils.Increasing the voltage of the current.
10Magnets and Electricity Electromagnets are used in every day life:In telephones, electric motors, generators, televisions, door bells.You can see a huge electromagnet in action in a junkyard. A crane holding the electromagnet can be used to pick up metal pieces when current flows through it. When the crane operator wants to drop the scrap, he or she will simply shut off the current to the electromagnet.