CIE IGCSE Physics: Magnetism notes

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  • Created on: 11-03-13 08:14
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IGCSE Physics: Magnetism
Varshini 11C
MAGNETISM
1. STATE THE PROPERTIES OF MAGNETS
Magnets have north and south Magnets attract the opposite Magnets repel the same poles:
poles. poles: North repels North
1. North attracts South
2. South attracts North
Magnets repel the same poles: Magnets line of with the Earth's Magnets are used in compasses
South repels South magnetic field. as the magnetised northern tip of
the needle aligns itself with the
lines of the magnetic field on
earth.
2. GIVE AN ACCOUNT OF INDUCED MAGNETISM
Magnetic Induction is a way of making magnetic materials like steel and
iron into magnets.
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IGCSE Physics: Magnetism
Varshini 11C
To induce a material, we need to:
Place a magnetic material (a paper clip for example) to a strong magnet without touching.
The paper clip will become an induced magnet, which means the end of the paper clip closer to
the magnet has the opposite pole to that of the magnet.
The paper clip is attracted to the magnet.
This process shows how magnetic materials can be attracted to magnets.
Magnetic Induction is used in Induction cooking:
3.…read more

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IGCSE Physics: Magnetism
Varshini 11C
Magnetisation is a process by which an object can be made into a magnet.
Only ferrous materials can be made into magnets.
How to magnetise an object?
1. Stroke an object, for example an iron bar in one direction using the
magnet as shown in the picture.
2. The iron bar will become magnetic.
3. We know that the iron bar is magnetic because the iron can get
attracted or attached to a magnetic object.…read more

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IGCSE Physics: Magnetism
Varshini 11C
6. DISTINGUISH BETWEEN THE MAGNETIC PROPERTIES OF IRON AND STEEL
Iron is a soft or temporary magnetic material; it quickly loses its magnetism when the magnetizing field
is removed.
Steel is a hard or permanent magnetic material; it does not readily lose its magnetism when magnetized.
7. DISTINGUISH BETWEEN THE DESIGN AND USE OF PERMANENT MAGNETS AND ELECTROMAGNETS
Permanent Magnet Electromagnet
1. A permanent magnet is a simple magnet. 1. It can be switched on and off.
2.…read more

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