PIRA 5G50.00 TEMPERATURE AND MAGNETISM

DCS #DEMONSTRATIONREFERENCEABSTRACT
5G50.00Temperature and Magnetism
5G50.10Curie pointPIRA 500
5G50.10Curie point5G50.10Iron under magnetic attraction is heated until it falls away. Upon cooling it is again attracted.
5G50.10Curie temperatureEs-8A counterweighted iron wire is attracted to a magnet until heated red with a flame.
5G50.11Curie pointEs-6A long soft iron wire held up by a magnet falls off when the wire is heated past the Curie point.
5G50.11Curie PointE-104A length of soft iron wire heated with 110 V DC through a rheostat shows loss of magnetic properties when it passes through recalescence.
5G50.12Curie point32-3.20A pendulum bob with iron wire tips is attracted to a magnet where it is heated until it loses its magnetism and falls away. The cycle repeats. Picture, Diagram.
5G50.13Curie point with monel metalAJP 37(3),334Monel metals have curie points between 25 C and 100 C depending on the alloy.
5G50.14Curie temperatureE-10a.1A nickel wire falls away from a magnet when heated.
5G50.15Curie nickelPIRA 1000
5G50.15Curie point of nickelE-103A rod of nickel is attracted to a magnet when cool but swings away when heated. Many hints and diagram.
5G50.15Curie NickelDisc 19-24A Canadian nickel is attracted to a magnet until it is heated with a torch.
5G50.16nickel hysteresis surfaceAJP 56(1),45Pictures of a 3-D HMT hysteresis surface for nickel.
5G50.20thermomagnetic motorPIRA 1000
5G50.20thermomagnetic motor32-3.22Local heating of permalloy tape or nickel rings in a magnetic field will cause rotation. AJP 5(1),40.
5G50.20Monel wheel32-3.21The rim of a wheel of Monel tape is placed in the gap of a magnet and heat is applied to one side to make the wheel turn.
5G50.20magnetic heat motorE-110A thin strip of magnetic alloy around the rim of a well balanced wheel is placed in the gap of a magnet with a light focused on a point just above the magnet. Heating changes the magnetic properties and the wheel rotates.
5G50.20Curie temperature wheelDisc 19-25A rim of nickel on a wheel is heated just above the point where the rim passes through the gap of a magnet.
5G50.22magnetic heat engineAJP 58(6),545A gadolinium strip forming the rim of a plexiglass wheel is heated and cooled on opposite sides of a magnetic field, and a weight is lifted by the resulting rotation.
5G50.23Curie temperature motorE-10a.2A soft iron disk heated on an edge turns very slowly when a magnet is oriented correctly.
5G50.24Curie point engineAJP 55(1),48Use the Curie point engine as a simple demonstration of the Carnot principle.
5G50.25dysprosium in liquid nitrogenPIRA 1000
5G50.25dysprosium in liquid nitrogenDisc 19-23A piece of dysprosium is attracted to a magnet when cooled to liquid nitrogen temperatures but drops away when it warms up.
5G50.30phase change and susceptibility32-3.19Heat the long iron wire and watch the sag. A ferrite ring and coil connected to a galvanometer show change in ferromagnetic susceptibility.
5G50.35hysteresis breakdown at Curie temp.32-3.18Elaborate apparatus to show hysteresis loop and breakdown at Curie temperature. Picture, Diagrams, Materials list in appendix, p. 1333.
5G50.40adiabatic demagnetization32-5.1The temperature of a piece of gadolinium is measured with a thermocouple while it is between the poles of an electromagnet.
5G50.50Meissner effectPIRA 200Cool a superconductor and a magnet floats over it due to magnetic repulsion.
5G50.50Meissner effect5G50.50
5G50.50superconductorsDisc 16-14Place a small powerful magnet over a disc of superconducting material cooled to liquid nitrogen temperature.
5G50.51levitating magnetTPT 28(4),205A long article on levitation over superconductors showing several variations.
5G50.52Meissner effectAJP 56(7),617Repulsion of the magnet and superconductor hanging from threads. Also, levitation of the magnet over the superconductor.
5G50.53Meissner effect with a cork and saltAJP 56(11),1039A magnet/cork in a vial filled with salt water so the float just sinks is placed over the superconductor.
5G50.55Meissner effect with liquid HeAJP 39(1),113Technique for levitating a magnet over liquid He.
5G50.55floating magnet demonstrationTPT 28(6),395A room temperature magnet is suspended 2 cm above a liquid helium cooled (5l/hr) lead plate in a supercooled container. Students can play with the magnet and feel the force. Discussion of what the Meissner effect really is.
5G50.56detailed explaination of levitationAJP 59(1),16Theoretical article - a discussion of levitation and other effects using Maxwell's work on eddy currents in thin conducting sheets instead of the London equation.
5G50.58Meissner oscillatorAJP 57(10),955A pivoting needle with magnets on the ends oscillates between two superconducting discs.

ReferenceDescription
M-1Sutton
Ma-1Freier & Anderson
M-1dHilton
8-2.8Meiners
1A12.01University of Minnesota Handbook
AJP 52(1),85American Journal of Physics
TPT 15(5),300The Physics Teacher
Disc 01-01The Video Encyclopedia of Physics Demonstrations

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