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Electromagnetic Wine
Superconductors are materials that offer no electrical resistance when cooled below a certain temperature. Apart from allowing the current to pass without resistance these materials are known to repel the magnetic field. In a useful type of superconductor, however, the magnetic field passes through a narrow region around which super currents circulate. This entity is called a vortex. The vortices are arranged in a regular pattern (Abrikosov Lattice). Here the squeezing of the magnetic lines forces through the vortex assumes a shape of a wine glass.