Why outlets spark when unplugging - EMF & Inductors

How to shrink a quarter: https://www.youtube.com/watch?v=d2TDXKfBaMQ Oxygen is magnetic? https://www.youtube.com/watch?v=pB-qAwkgfFQ Get your first two months of CuriosityStream free by going to http://curiositystream.com/physicsgirl and using the promo code “physicsgirl” When we cut the electricity to an inductor, we get a sudden intense spark across the switch. This is known as inductive kickback or a back EMF and is produced because of Faraday’s Law of Induction. Not mean to be tried at home! The inductor doesn’t want to change its current, so the change in magnetic field creates an EMF resulting in a high voltage across the switch. #PHYSICS http://physicsgirl.org/ http://twitter.com/thephysicsgirl http://facebook.com/thephysicsgirl http://instagram.com/thephysicsgirl Creator/Host: Dianna Cowern Editor: Jabril Ashe Animations: Dianna, Jabril & Kyle Norby Thanks to Dan Walsh, Josh Wolfe, and the MIT Technical Services Group! Music: APM and YouTube Happy Physicsing!