Superconductive Levitation

Added by | 8 yearss ago


This video demonstrates the levitation achieved using a superconductor and strong neodymium magnets. A YBCO superconductor was used and cooled, using liquid nitrogen, to below its critical temperature of -294°F. This demonstration was performed for SCIENCE NIGHT 2012 THE LEVITATION The levitation shown in this demonstration is an example of the Meissner Effect. According to Faraday's Law of Induction, when a conductor is introduced to a change in magnetic flux, a current is induced in the conductor. Inversely, if a current is induced in a conductor a magnetic field is created around the conductor. With standard conductors, the induced current is often dissipated because of the resistance of the conductor. In the case of the superconductor, the cycle of Faraday's law is continuous because no energy is lost to resistance. Because of this, superconductors are strongly diamagnetic, meaning that that they repel magnets. Faraday's law alone does not explain the Meissner Effect. Below the critical temperature of a superconductor, small dipoles are created. These dipoles oppose the applied magnetic field. These dipoles also stop any magnetic field from entering the superconductor. Because of this, levitation results. What is truly striking about this levitation is that the system appears to be in stable equilibrium. This is caused by Flux Pinning in which lines of magnetic flux pass through the superconductor and are "pinned" on imperfections within the disk. THE SUPERCONDUCTOR ...


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