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The Sci Guys: Science at Home - SE2 - EP9: Boyle's Law of Ideal Gases

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The Sci Guys: Science at Home - Magnet in a Copper Tube Experiment - Eddy Currents & Lenz's Law

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Welcome to science at home episode five, season three. In this episode we look at how and why eddy currents are generated when you drop a magnet down a copper tube. Eddy currents are electrical currents generated within a conductor when it is exposed to a changing magnetic field. When a magnet is dropped within a copper tube, it falls much slower then when it's dropped outside of the copper tube. At the end of the episode you will be able to explain what eddy currents are, what Lenz's law is and you will be able to demonstrate the slowing effect of eddy currents and Lenz's law on a magnet when it's dropped down a copper tube.
  • Copper Tube
  • Small Strong Magnet (The stronger the magnet the better)
  • Piece of Metal the same weight and size as the magnet
  • Lab Coat or Apron
  • Goggles
  1. Hold the magnet in one hand and the piece of metal in the other
  2. Drop both the magnet and piece of metal at the same time
  3. In one hand hold the copper tube vertically
  4. Drop the piece of metal down the copper tube and make note of how long it takes to fall through the tube
  5. Drop the magnet down the copper tube and make note of how long it takes to fall through the tube

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