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- Electromagnet abstract "An electromagnet is a type of magnet in which the magnetic field is produced by electric current. The magnetic field disappears when the current is turned off. Electromagnets are widely used as components of other electrical devices, such as motors, generators, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment, as well as being employed as industrial lifting electromagnets for picking up and moving heavy iron objects like scrap iron.An electric current flowing in a wire creates a magnetic field around the wire, due to Ampere's law (see drawing below). To concentrate the magnetic field, in an electromagnet the wire is wound into a coil with many turns of wire lying side by side. The magnetic field of all the turns of wire passes through the center of the coil, creating a strong magnetic field there. A coil forming the shape of a straight tube (a helix) is called a solenoid.Much stronger magnetic fields can be produced if a "core" of ferromagnetic material, such as soft iron, is placed inside the coil. The ferromagnetic core increases the magnetic field to thousands of times the strength of the field of the coil alone, due to the high magnetic permeability μ of the ferromagnetic material. This is called a ferromagnetic-core or iron-core electromagnet.The direction of the magnetic field through a coil of wire can be found from a form of the right-hand rule. If the fingers of the right hand are curled around the coil in the direction of current flow (conventional current, flow of positive charge) through the windings, the thumb points in the direction of the field inside the coil. The side of the magnet that the field lines emerge from is defined to be the north pole.The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be rapidly manipulated over a wide range by controlling the amount of electric current. However, a continuous supply of electrical energy is required to maintain the field.".
- Electromagnet thumbnail Simple_electromagnet2.gif?width=300.
- Electromagnet wikiPageExternalLink mag_basic.html.
- Electromagnet wikiPageExternalLink mdipole.htm.
- Electromagnet wikiPageExternalLink magnets.
- Electromagnet wikiPageID "92377".
- Electromagnet wikiPageRevisionID "606392430".
- Electromagnet align "left".
- Electromagnet align "right".
- Electromagnet caption "1830.0".
- Electromagnet caption "AC electromagnet on the stator of an electric motor".
- Electromagnet caption "Electromagnet used in the Tevatron particle accelerator, Fermilab, USA".
- Electromagnet caption "Laboratory electromagnet. Produces 2 T field with 20 A current.".
- Electromagnet caption "Magnet in a mass spectrometer".
- Electromagnet caption "Magnets in an electric bell".
- Electromagnet caption "Sturgeon's electromagnet, 1824".
- Electromagnet direction "horizontal".
- Electromagnet hasPhotoCollection Electromagnet.
- Electromagnet image "AGEM5520.jpg".
- Electromagnet image "DoorBell 001.jpg".
- Electromagnet image "Fermilab - 400 MeV Lambertson Magnet.jpg".
- Electromagnet image "ICP-SFMS Magnet 1.JPG".
- Electromagnet image "Joseph Henry electromagnet.png".
- Electromagnet image "Stator eines Universalmotor.JPG".
- Electromagnet image "Sturgeon electromagnet.png".
- Electromagnet width "113".
- Electromagnet width "140".
- Electromagnet width "150".
- Electromagnet width "160".
- Electromagnet width "163".
- Electromagnet width "205".
- Electromagnet width "80".
- Electromagnet subject Category:Concepts_in_physics.
- Electromagnet subject Category:Electromagnetism.
- Electromagnet subject Category:Smithsonian_Institution_Archives_related.
- Electromagnet subject Category:Types_of_magnets.
- Electromagnet comment "An electromagnet is a type of magnet in which the magnetic field is produced by electric current. The magnetic field disappears when the current is turned off.".
- Electromagnet label "Electroimán".
- Electromagnet label "Electromagnet".
- Electromagnet label "Elektromagneet".
- Electromagnet label "Elektromagnes".
- Electromagnet label "Elektromagnet".
- Electromagnet label "Eletroímã".
- Electromagnet label "Elettromagnete".
- Electromagnet label "Électroaimant".
- Electromagnet label "Электромагнит".
- Electromagnet label "مغناطيس كهربي".
- Electromagnet label "電磁石".
- Electromagnet label "電磁鐵".
- Electromagnet sameAs Elektromagnet.
- Electromagnet sameAs Elektromagnet.
- Electromagnet sameAs Electroimán.
- Electromagnet sameAs Elektroiman.
- Electromagnet sameAs Électroaimant.
- Electromagnet sameAs Elettromagnete.
- Electromagnet sameAs 電磁石.
- Electromagnet sameAs 전자석.
- Electromagnet sameAs Elektromagneet.
- Electromagnet sameAs Elektromagnes.
- Electromagnet sameAs Eletroímã.
- Electromagnet sameAs m.0mzn1.
- Electromagnet sameAs Q178032.
- Electromagnet sameAs Q178032.
- Electromagnet wasDerivedFrom Electromagnet?oldid=606392430.
- Electromagnet depiction Simple_electromagnet2.gif.
- Electromagnet isPrimaryTopicOf Electromagnet.