Watch and learn a little about electromagnetic induction (or how we'll finally get hoverboards)
(CBS News) While we've covered the topics of electromagnetic induction and quantum levitation before (or how we will finally end up getting those awesome levitating hoverboards from "Back to the Future 2"), you can never watch and learn enough about this fascinating science. So, watch and learn a little more about electromagnetic induction with the amazing video above.
The video was posted by Veritasium, who was previously featured here on The Feed for a lesson in physics using a slinky in slow-motion, and who write about this latest work:
At the Palais de la Decouverte in Paris, they showed me this experiment where a 1kg aluminium plate is levitated above a large coil of wire that is being supplied with 800A of alternating current at 900Hz. This is by far the best demonstration of electromagnetic induction I have ever seen.
Back in London, I visited the magnetic lab of Michael Faraday in the basement of the Royal Institution. It was here that he did his groundbreaking work on induction. People had previously observed that current in a wire causes a compass needle to deflect, but more exciting was the prospect of using a magnetic field to generate current. Faraday created his famous induction ring by winding two coils of insulated wire onto an iron ring. When he connected a battery to one coil, a small pulse of current was induced in the other. When the battery was disconnected, current was induced in the other direction. This led Faraday to the conclusion that current was induced in the second coil only when the magnetic field through it was changing.
Honestly, I really love that Veritasium will not only show you science in action, but also teach you about the how and why with each of their videos. A big triple-rainbow salute of awesome education goes out to them for yet another phenomenal piece of work! And if you'd like to check out more videos from Veritasium, you can visit their YouTube page by clicking here.
And if they hadn't been wrapped on the same ring, Faraday may have noticed that the two coils repel each other when the current is induced due to the interaction of their magnetic fields. This is the same thing that is happening with the aluminium plate, except we're using alternating current to create a continually changing magnetic field. This induces an alternating current in the plate, producing an opposing magnetic field which levitates the disk.
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