Μάθημα : ΦΥΣΙΚΗ ΚΑΤΕΥΘΥΝΣΗΣ Γ ΛΥΚΕΙΟΥ

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. 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

How do you take copper wire, a battery and magnets and make electric train? With science! This super simple DIY physics demo uses electromagnetic induction to propel a train made of magnets and batteries. Inspiring video: https://www.youtube.com/watch?v=J9b0J

Science experiments to do at home! It is Awesome and stunning electromagnetic tricks that you can repeat at home as well, studying science and experiments. I made this video in 8 interesting scientific experiments: 1. 0:16 Two coils with magnets: one affects the other through the wire. 2. 1:48 Electromagnetic forces are pushing a cart with a magnet, and she starts drastically. 3. 2:24 The conductor revolves around a magnet in salt water. 4. 4:07 The electromagnetic coil currents are forced to jump back and forth. 5. 4:45 The transfer of energy from a distance using a high-frequency electromagnetic field. 6. 6:11 Two coils hang close and repelled when the voltage is switched on. 7. 6:52 The magnet inside the coil jumps. Very funny. :) 8. 7:29 Simple electromagnetic vibrator: 1 AA battery, 1 magnet and 1 meter of wire.