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  2. Arago's rotations - Wikipedia

    en.wikipedia.org/wiki/Arago's_rotations

    Arago's rotations is an observable magnetic phenomenon that involves the interactions between a magnetized needle and a moving metal disk. The effect was discovered by François Arago in 1824. At the time of their discovery, Arago's rotations were surprising effects that were difficult to explain. In 1831, Michael Faraday introduced the theory ...

  3. Electromagnet - Wikipedia

    en.wikipedia.org/wiki/Electromagnet

    To concentrate the magnetic field in an electromagnet, the wire is wound into a coil with many turns of wire lying side by side. [2] The magnetic field of all the turns of wire passes through the center of the coil, creating a strong magnetic field there. [2] A coil forming the shape of a straight tube (a helix) is called a solenoid. [1] [2 ...

  4. Force between magnets - Wikipedia

    en.wikipedia.org/wiki/Force_between_magnets

    Force between magnets. Magnets exert forces and torques on each other through the interaction of their magnetic fields. The forces of attraction and repulsion are a result of these interactions. The magnetic field of each magnet is due to microscopic currents of electrically charged electrons orbiting nuclei and the intrinsic magnetism of ...

  5. Induction coil - Wikipedia

    en.wikipedia.org/wiki/Induction_coil

    The other coil, the secondary winding, (S) typically consists of up to a million turns of fine wire (up to 40 gauge). [8] [1] [7] An electric current is passed through the primary, creating a magnetic field. [1] [7] Because of the common core, most of the primary's magnetic field couples with the secondary winding.

  6. Magnet wire - Wikipedia

    en.wikipedia.org/wiki/Magnet_wire

    Inductor made with magnet wire wound around a toroidal core. Magnet wire or enameled wire is a copper or aluminium wire coated with a very thin layer of insulation.It is used in the construction of transformers, inductors, motors, generators, speakers, hard disk head actuators, electromagnets, electric guitar pickups, and other applications that require tight coils of insulated wire.

  7. American wire gauge - Wikipedia

    en.wikipedia.org/wiki/American_wire_gauge

    American Wire Gauge (AWG) is a logarithmic stepped standardized wire gauge system used since 1857, predominantly in North America, for the diameters of round, solid, nonferrous, electrically conducting wire. Dimensions of the wires are given in ASTM standard B 258. [1] The cross-sectional area of each gauge is an important factor for ...

  8. Superconducting wire - Wikipedia

    en.wikipedia.org/wiki/Superconducting_wire

    Superconducting wire. An example of a wire (V 3 Ga alloy) used in a superconducting magnet. Superconducting wires are electrical wires made of superconductive material. When cooled below their transition temperatures, they have zero electrical resistance. Most commonly, conventional superconductors such as niobium–titanium are used, [1] but ...

  9. Knob-and-tube wiring - Wikipedia

    en.wikipedia.org/wiki/Knob-and-tube_wiring

    Earthing systems. v. t. e. Knob-and-tube wiring (sometimes abbreviated K&T) is an early standardized method of electrical wiring in buildings, in common use in North America from about 1880 to the 1930s. [1][2] It consisted of single-insulated copper conductors run within wall or ceiling cavities, passing through joist and stud drill-holes via ...

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