vortices - University of Toronto Physics
... The vortices themselves are quantum excitations- so they also have a probability density! They have fascinating properties, many of which were first discussed by Feynman in the early 1950’s, as fully quantum-mechanical objects. We now know that most of the flow properties of He superfluid are govern ...
... The vortices themselves are quantum excitations- so they also have a probability density! They have fascinating properties, many of which were first discussed by Feynman in the early 1950’s, as fully quantum-mechanical objects. We now know that most of the flow properties of He superfluid are govern ...
Electric Currents – The Key to Magnetic Fields
... of an observed phenomenon that cannot be understood without reference to the electric currents that cause it. And even though data supporting the electrical model proposed here were published as long ago as 1997, mainstream astronomers have not yet begun to acknowledge the importance of electric cur ...
... of an observed phenomenon that cannot be understood without reference to the electric currents that cause it. And even though data supporting the electrical model proposed here were published as long ago as 1997, mainstream astronomers have not yet begun to acknowledge the importance of electric cur ...
in a magnetized material
... aˆ x ILWB aˆ z ILW B magnetic dipole moment of loop Lecture 8 ...
... aˆ x ILWB aˆ z ILW B magnetic dipole moment of loop Lecture 8 ...
Chapter 21 - OpenWetWare
... The magnitude of the force on the wire is found by F ILB sin 20 A0.10 m0.8T sin 45 1.13 N The direction of the force can be found by the right-hand rule. Place your fingers in the direction of the magnetic field, and your thumb in the direction of the length (and current) which is per ...
... The magnitude of the force on the wire is found by F ILB sin 20 A0.10 m0.8T sin 45 1.13 N The direction of the force can be found by the right-hand rule. Place your fingers in the direction of the magnetic field, and your thumb in the direction of the length (and current) which is per ...
Conceptual Physics - Southwest High School
... instance, sunspots consist of glowing hot gas, yet they are all intensely magnetic. The Earth's own magnetic powers arise deep in its interior, and temperatures there are too high for iron magnets, which lose all their power when heated to a red glow. What goes on in those magnetized regions? It is ...
... instance, sunspots consist of glowing hot gas, yet they are all intensely magnetic. The Earth's own magnetic powers arise deep in its interior, and temperatures there are too high for iron magnets, which lose all their power when heated to a red glow. What goes on in those magnetized regions? It is ...
Magnetic induction: Motional EMF, Faraday`s law, Induced electric
... EMF, ultimately stemming from the Lorentz forces on the electrons in the moving wires. But the physics underlying the other two methods seems to be quite different: Moving a magnet or varying the current through an electromagnet makes a time-dependent magnetic field, which induces a non-potential el ...
... EMF, ultimately stemming from the Lorentz forces on the electrons in the moving wires. But the physics underlying the other two methods seems to be quite different: Moving a magnet or varying the current through an electromagnet makes a time-dependent magnetic field, which induces a non-potential el ...
Nobel Lecture - APS Link Manager
... 共Ginsburg, 1955a兲 that eⴱ = 共2 – 3兲e. When I discussed this result with Landau, he raised an objection, which he had evidently been guided by before, though had not advanced it. Specifically, with the charge eⴱ assumed to be an effective quantity like, say, the effective mass meff in the theory of m ...
... 共Ginsburg, 1955a兲 that eⴱ = 共2 – 3兲e. When I discussed this result with Landau, he raised an objection, which he had evidently been guided by before, though had not advanced it. Specifically, with the charge eⴱ assumed to be an effective quantity like, say, the effective mass meff in the theory of m ...
7.1 Permanent Magnets
... the storage of data on audio and video tape as well as on computer disks. In the world of medicine, they are used in body scanners as well as a range of applications where they are attached to or implanted into the body. The home entertainment market relies on magnetic materials in applications such ...
... the storage of data on audio and video tape as well as on computer disks. In the world of medicine, they are used in body scanners as well as a range of applications where they are attached to or implanted into the body. The home entertainment market relies on magnetic materials in applications such ...
Superconductivity
Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in certain materials when cooled below a characteristic critical temperature. It was discovered by Dutch physicist Heike Kamerlingh Onnes on April 8, 1911 in Leiden. Like ferromagnetism and atomic spectral lines, superconductivity is a quantum mechanical phenomenon. It is characterized by the Meissner effect, the complete ejection of magnetic field lines from the interior of the superconductor as it transitions into the superconducting state. The occurrence of the Meissner effect indicates that superconductivity cannot be understood simply as the idealization of perfect conductivity in classical physics.The electrical resistivity of a metallic conductor decreases gradually as temperature is lowered. In ordinary conductors, such as copper or silver, this decrease is limited by impurities and other defects. Even near absolute zero, a real sample of a normal conductor shows some resistance. In a superconductor, the resistance drops abruptly to zero when the material is cooled below its critical temperature. An electric current flowing through a loop of superconducting wire can persist indefinitely with no power source.In 1986, it was discovered that some cuprate-perovskite ceramic materials have a critical temperature above 90 K (−183 °C). Such a high transition temperature is theoretically impossible for a conventional superconductor, leading the materials to be termed high-temperature superconductors. Liquid nitrogen boils at 77 K, and superconduction at higher temperatures than this facilitates many experiments and applications that are less practical at lower temperatures.