https://physlab-wiki.com/ 2026-05-16T08:16:57+00:00 https://physlab-wiki.com/ https://physlab-wiki.com/lib/tpl/UChicago/images/favicon.ico text/html 2021-11-05T18:23:45+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/physics_with_a_bang/electricity_and_magnetism/eddy_current_pipe?rev=1636151025&do=diff Eddy Current Pipe A large permanent magnet dropped down a copper pipe takes a very long time to reach the bottom. Magnetic tape attached to the pipe allows the magnet to be located during its descent. B2 top, D3 PIRA DCS 5K20.25 text/html 2021-11-05T18:36:12+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/physics_with_a_bang/electricity_and_magnetism/resistance_of_wire_at_low_temperature?rev=1636151772&do=diff Resistance of Wire at Low Temperature A light bulb is powered in series with a coil of thin copper wire. Initially the coil is at room temperature and, because of its resistance, the bulb is only faintly lit. When the coil is immersed in liquid nitrogen, its resistance is quickly and substantially reduced causing the bulb to glow very brightly. text/html 2021-11-08T14:43:04+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/physics_with_a_bang/electricity_and_magnetism/superconductor_train?rev=1636400584&do=diff Superconductor Train A styrofoam model of a train contains a piece of a type-2 superconducting material. Liquid nitrogen is poured into the train as it is held a small distance above a track which is permanently magnetic, cooling the superconductor and trapping the magnetic flux that is present in it. The track is made from three rows of permanent, high-strength magnets which, in cross-section, are oriented N-S-N. Once cooled, the train will levitate and remain aligned with the track.