by Ciro Santilli (@cirosantilli, 37)
We define a "water compass" as a compass made by placing a magnet floating on a water surface to reduce friction and allow it to align with the Earth's magnetic field. This is a common children's scientific experiment.
Video 1.
Bar magnet aligns with Earth's magnetic axis by KClassScienceChannel
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  1. Compass
  2. Magnet
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