For this experiment you will need a copper pipe and a very strong magnet. An aluminum pipe should also work, but I have not tried it.
Copper is not magnetic, so copper and a magnet may seem like a strange supply list, but this is an awesome demonstration.
The demonstration is simple. Drop a small magnet in a copper pipe. It seems like it would drop just as fast as it would if you did not have a pipe. But strangely it drops slowly down through the pipe. It is very surreal, like the magnets are floating in outer-space. My kids never want to put the materials away; they just want to drop the magnet over and over.
What is happening?
The pipe is not magnetic (if it was, the magnet would just stick to it and go nowhere). However the motion of the magnet induces a magnetic field in the pipe. Basically as the magnet moves, it pushes the electrons in the pipe around and makes the copper temporarily magnetic.
Magnetic fields are one of the invisible parts of God’s Creation, and a lot of fun.