 Welcome back to Kids Fun Science. My name is Ken. Today's experiment is the eddy current tubes. As always, adult supervision is required. What you need for this experiment is a copper tube about two to three feet long and some rare earth magnets. I use four of them. As you can see, this copper pipe is non-magnetic as it will not hold these four rare earth magnets as they drop out completely down the pipe within a second. In this test I'm using a AA battery where you can see it drops completely through the copper tube with less than a second. I'm going to drop four earth magnets down this copper pipe when the second hand reaches the 12. A AA battery took about one second and this is going to take five. One, two, three, four, and five. When we look down the copper tube as the magnet is falling, you can see the magnet never touches the size of the copper tube. Therefore, friction does not have a roll in slowing down the magnet. When the magnet drops from the copper tube it produces a magnetic field as it falls through the magnetic field changes. This introduces a magnetic current as predicted by Faraday's law. Faraday's law states any changes in a magnetic environment of the copper tube will cause the voltage to be induced into the copper tubing. This induced voltage creates an electric current to the copper called eddy currents. This phenomenon is called lenses law. The magnetic field introduced into the magnetic attracts the falling magnet creating a resistance. This resistance is what slows down your magnet. As your magnet slows down it stops generating as much current which reduces the resistance acting on the magnet's movement. The gravity speeds up the magnet back up until it reaches that happy medium speed. Basically your magnet is creating a whirlpool of electrons around it as it falls through the pipe. I hope you enjoyed this experiment. If you did remember to click thumbs up and share and thanks for watching.