5K20.25 - Magnet and Copper Tube




Code: 5K20.25


Demo Title: Magnet and Copper Tube


Subject: Eddy Currents


Description:
A magnet is dropped through a copper tube producing eddy currents that slow the magnet's motion as it passes through the tube


Procedure:

  • Emphasize to students that the magnet has charge by moving it closer to compass and show how it pulls both sides of the needle
  • Show how magnet does not stick to copper tube (because it is non-magnetic material), but show that it does create resistance by moving the magnet on the outside of the tube
  • Place magnet inside of copper tube and show how it falls slowly
  • Place wooden ball inside of copper tube and show how it falls faster (no flux lines)
  • Explain that strong magnetic field of magnet corresponds with magnetic field in copper tube

  • Video URL:


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