Magnetism (AQA GCSE Physics): Revision Notes
📚 Revision Notes
7.1.2 Permanent & Induced Magnets
Permanent Magnets
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Permanent magnets are magnets which always create their own magnetic field. Their magnetism cannot be turned on and off. So, they are always exerting a force on other magnets or magnetic materials.
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When referring to magnets, such as common bar magnets or horseshoe magnets, we are talking about permanent magnets.
Induced Magnets
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Induced magnets, also known as temporary magnets, become magnetised when placed in a magnetic field. However, induced magnets are only attracted to other magnets; they cannot repel them.
For example, iron filings become induced magnets when they are near bar magnets.
- Materials that are "magnetic" but do not have fixed poles
- When the magnetic field is taken away, induced magnets lose most or all their magnetism.
- Can be made into temporary magnets by 'stroking' them with a permanent magnet. So, when induced and permanent magnets are near each other, there is always an attraction.
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Examples: Iron, Nickel, Cobalt