5G10.15 Lodestone


The magnetic properties of a lodestone (a natural, permanent magnet)


The magnetic properties of a lodestone are demonstrated using a bar magnet, a compass, and a sewing needle. Note: this demonstration can be shown on the overhead projector and is appropriate for large lecture halls.



  • [1] Lodestone
  • [1] Bar magnet
  • [1] Compass
  • [1] Sewing needle
  • [1] Thread
  • [1] Tape


  1. Attach the lodestone to the overhead projector with string and tape so that it hangs freely.
  2. Hold the bar manget near the lodestone. Note the movement of the lodestone.
  3. Remove the lodestone from the overhead projector.
  4. Place the compass on the overhead projector.
  5. Hold the lodestone near the compass. Note the movement of the compass needle.
  6. Place the sewing needle on the overhead projector.
  7. Pick up the sewing needle with the lodestone.


Additional Resources


  • PIRA 5G10.15


  • Don't attempt this at home!

Last revised

  • 2018


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If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.