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A magnet is an object that creates a magnetic field. This magnetic field creates an invisible force of attraction or repulsion depending on the materials it interacts with.
Magnetism will attract objects made of iron, cobalt, nickel and some steel. (It must be noted that not all steel are magnetic). These are called ‘magnetic materials.’
Natural Magnets are found in rocks like lodestone, pyrrhotite, columbite and magnetite.
Artificial Magnets are man-made :
There are 3 main groups of magnets:
- permanent magnets- made of iron/alloys/steel and remains magnetised
- temporary magnets- soft iron like nails and paper clips that loses magnetism
- electromagnets- formed by wire coils that induce a magnetic field when electric current passes through the wires.
Magnetic Fields are invisible but can be seen using iron fillings. It can also be traced out by using a compass. Magnetic Fields are separated to its poles. We assign North and South to the opposing ends of the magnetic poles.
Magnetisation and de-magnetisation methods.
- single touch method
- double touch method
- electrical method
- electrical induction
- heating with a hammer
Different types of magnets
- bar magnet
- horseshoe magnet
- cylindrical magnet
- ring magnet
- spherical magnet
Magnetic and Non-magnetic materials.
Magnetic materials will experience an attraction force to magnets. Non-magnetic materials will have no effect when it comes into a magnetic field.
Magnetic Materials are:
- certain steel
Non-magnetic materials are:
Magnetism can pass through non-magnetic materials and cannot pass through magnetic materials.
Magnets can destroy things.
More information on Magnets can be found here.