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What are magnetic fields? - OCR 21st CenturyPoles of a magnet

Magnetism is caused by the fields that exist around magnets. These magnetic fields can be investigated by looking at the effects of the forces they exert on other magnets and magnetic materials.

Part of Physics (Single Science)Electric circuits

Poles of a magnet

A can exert a force on another nearby magnet. Magnets have two poles:

  • a
  • a

force is strongest near a magnet's poles.

A bar magnet, with the north and south poles marked red and blue.

The rules of magnetism

Two magnets will either attract or repel each other in the following way:

  • like poles (N-N or S-S) repel
  • unlike poles (N-S or S-N) attract

Magnetic forces are - this means that magnets affect each other without touching.