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Induced Magnet

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Key Stage 3

Meaning

An induced magnet is an object that only has its own magnetic field when it is in another external magnetic field.

About Induced Magnets

Objects made of pure Iron can be induced magnets.
Induced magnets are used as the core of electromagnets.

Key Stage 4

Meaning

An induced magnet is an object that only has its own magnetic field when it is in another external magnetic field.

About Induced Magnets

Objects made of pure Iron can be induced magnets.
Induced magnets are used as the core of electromagnets.
A magnet is made of several small magnetic domains which are regions in the magnet which act as smaller magnets. In an induced magnet these magnetic domains can be easily changed so that if an external magnetic field is applied they will all line up in the same direction.
MagneticDomainsUnaligned.png
MagneticDomainsAligned.png
When there is no external magnetic field the magnetic domains are not aligned so the object is not a magnet because the effect of the magnetic domains cancels out. When there is an external magnetic field the magnetic domains align so the object becomes a magnet.

References

AQA

Induced magnets, page 217, GCSE Combined Science Trilogy; Physics, CGP, AQA
Induced magnets, page 223, GCSE Physics, Hodder, AQA
Induced magnets, page 229, GCSE Combined Science; The Revision Guide, CGP, AQA
Induced magnets, page 290, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA
Induced magnets, page 92, GCSE Physics; The Revision Guide, CGP, AQA
Induced magnets, pages 277, GCSE Combined Science Trilogy 2, Hodder, AQA

Edexcel

Induced magnets, page 168, GCSE Physics, Pearson Edexcel
Induced magnets, page 402, GCSE Combined Science, Pearson Edexcel

OCR

Induced magnets, page 183, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR
Induced magnets, pages 120-121, 123, Gateway GCSE Physics, Oxford, OCR