GCSE Physics (AQA)

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Permanent & Induced Magnetism

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Magnetism and electromagnetism Permanent and induced magnetism, magnetic forces and fields

Permanent & Induced Magnetism

4:07 Introduction to Magnetic Fields
Spec 4.7.1.1 4.7.1.2
Previous Magnetic Poles Next Magnetic Field Lines
  • Permanent magnets always produce a magnetic field.
  • A bar magnet is an example of a permanent magnet with a constant magnetic field.
  • Magnetic forces are strongest at the two poles of a magnet.
  • Induced magnets only have a magnetic field in the presence of another magnetic field.
  • A steel screw can be an example of an induced magnet.
  • Normally, a screw doesn't have a magnetic field but acts like a magnet when in a bar magnet's field.
  • Induced magnets are always attractive, never repulsive.
  • Permanent magnets can be both attractive and repulsive.
  • Permanent magnets have two poles: a north seeking pole and a south seeking pole.
  • Unlike poles of permanent magnets attract each other, while like poles repel.
  • For exams, it's important to explain the differences between permanent and induced magnets, especially the types of forces they enact.
  • Induced magnets are always attracted to permanent magnets.
  • A metal spoon can act as an induced magnet when placed in a bar magnet's field.
  • The arrangement of poles in an induced magnet mirrors the magnet causing the induction.
  • Induced magnets lose their magnetism when the permanent magnet is removed.
  • Without the permanent magnet, the induced magnet cannot magnetize other objects, like a paperclip.

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