Explain the difference between a permanent magnet and an induced magnet.

AQA GCSE Physics (8463) — 4.7.1 Permanent and induced magnetism, magnetic forces and fields · Explain · 4 marks · View as Markdown

Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).

Model answer (4 marks)

A permanent magnet has a permanent magnetic field and is always magnetic.
An induced magnet only becomes magnetic when it is placed in an existing magnetic field.
When the external field is removed, the induced magnet loses its magnetism quickly.
An induced magnet always experiences a force of attraction towards the magnet producing the field.

Examiner tips

  • Use the exact phrases from the mark scheme – e.g. "produces its own magnetic field at all times". Show the cause–effect: external field → induced magnetism → attraction. Keep the answer short, one sentence per point to hit all 4 marks.

Common mistakes

  • Confusing a permanent magnet with a temporary magnet. Forgetting that an induced magnet only has magnetism in a field. Claiming an induced magnet can repel. Not mentioning that the magnetism disappears quickly after removal.

Mark scheme (4 marks)

  1. A permanent magnet produces its own magnetic field at all times / is always magnetic
  2. An induced magnet only becomes magnetic when placed in an existing magnetic field
  3. An induced magnet loses its magnetism quickly once it is removed from the magnetic field
  4. An induced magnet always experiences a force of attraction (towards the magnet producing the field) / induced magnetism always produces attractive forces

Key terms in this question

permanent magnet · induced magnet

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