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Permanent & Induced Magnets Simplified Revision Notes

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7.1.2 Permanent & Induced Magnets

Permanent Magnets

infoNote

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.

infoNote

When referring to magnets, such as common bar magnets or horseshoe magnets, we are talking about permanent magnets.

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Induced Magnets

infoNote

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

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