In this video we look at what happens when a magnet falls though a coil that is attached to light emitting diodes. The change in magnetic flux in the coil induces a current that lights the LEDs. This is known as electromagnetic induction and can be described qualitatively with Lenz's Law and quantitatively with Faraday's Law.
![](https://i.ytimg.com/vi/OOg4SIFCIiE/maxresdefault.jpg)