Charles includes it because it's neat and because he's introducing self-inductance, the third property of passive components (with resistance and capacitance),
I cut 6 feet of 22-gauge hook -up wire and wrapped it ~60 times around a screwdriver. I then attached alligator clips to the ends of the wire. When I connected the other ends of the clips to the poles of a AA battery, the paper clip moves towards the screwdriver. More fun!
Here's the video
Next we go on to generate electricity with a magnet (assuming that I can find 100 feet of magnet wire),
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