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# Topic: Electromagnetic induction

###### In the News (Wed 24 Apr 19)

 Electromagnetic induction - Wikipedia, the free encyclopedia Electromagnetic induction is the production of an electrical potential difference (or voltage) across a conductor situated in a changing magnetic flux. Michael Faraday is generally credited with having discovered the induction phenomenon in 1831 though it may have been anticipated by the work of Francesco Zantedeschi in 1829. Electromagnetic induction underlies the operation of generators, induction motors, transformers, and most other electrical machines. en.wikipedia.org /wiki/Electromagnetic_induction   (326 words)

 electromagnetic induction When magnetic tape is driven past the playback head (a small coil) of a tape recorder, the moving magnetic field induces an emf in the head, which is then amplified to reproduce the recorded sounds. The direction of an electromagnetically-induced current (generated by moving a magnet near a wire or by moving a wire in a magnetic field) will be such as to oppose the motion producing it. English scientist Michael Faraday proposed three laws of electromagnetic induction: (1) a changing magnetic field induces an electromagnetic force in a conductor;; (2) the electromagnetic force is proportional to the rate of change of the field; and (3) the direction of the induced electromagnetic force depends on the orientation of the field. www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0030295.html   (473 words)

 Causality, Electromagnetic Induction and Gravitation Starting with an analysis of causality in the phenomenon of electromagnetic induction, the author discovers a series of heretofore unknown or overlooked electromagnetic interdependencies and equations. Another similarly important discovery is that Lenz's law of electromagnetic induction is a manifestation of the previously ignored electric force produced by the time-dependent electric currents. Continuing his analysis of causal electromagnetic relations, the author finds that these relations are closely associated with the law of momentum conservation, and that with the help of the law of momentum conservation one can analyze causal relations not only in electromagnetic but also in gravitational systems. www.tfcbooks.com /mall/more/596cemi.htm   (584 words)

 Physics Tutoring: Electromagnetic Induction Electromagnetic Induction Experiments and find out how to launch a ring or crush a pop can with a circuit. Find out more about Michael Faraday and his experiments with electromagnetic induction. A: According to Faraday-Lenz law of electromagnetic induction, a current is generated in a closed conducting path (in this case the wall of the tube) if the cross-sectional area defined by the tube is traversed by a variable magnetic flux. ww2.slcc.edu /schools/hum_sci/physics/tutor/2220/em_induction   (678 words)

 electromagnetic induction and inertia We do not know the fine detail of the electron’s electric field structure, only the way it falls off as the square of the distance when we are some way away from the electron (in terms of the electron size). We cannot suspect the laws of induction, which are well-proven - electric motors work because induced fields containing energy, nor can we suspect the laws of relativity, which are again well proven, but there is little doubt the two are in conflict. Bear in mind that electromagnetic waves propagate by a falling magnetic field creating a rising electric field, and vice-versa, while moving electrostatic fields simply generate magnetic fields in situ. www.mariner.connectfree.co.uk /html/e_m_inertia.html   (1158 words)

 Applications of electromagnetic induction Electromagnetic induction is an incredibly useful phenomenon with a wide variety of applications. Induction is used in power generation and power transmission, and it's worth taking a look at how that's done. Rather than using a spinning coil in a constant magnetic field, another way to utilize electromagnetic induction is to keep the coil stationary and to spin permanent magnets (providing the magnetic field and flux) around the coil. physics.bu.edu /~duffy/PY106/Electricgenerators.html   (1879 words)

 Beyond Electromagnetic Induction   (Site not responding. Last check: 2007-10-14) The series of experiments which resulted in his discovery of electromagnetic induction in 1831 spanned a period of 10 years. Faraday's electromagnetic experiments in the 1830's were designed to discover the unifying principles underlying what seemed to be several kinds of electricity and magnetism. By the time he penned a response to Sir John Herschel's letter of 9 November,12 Faraday had tested the phenomenon thoroughly and was prepared to describe the new magneto-optical transmission effect to Herschel. www.cox-internet.com /hermital/book/holoprt5-1.htm   (1616 words)

 Electromagnetic Induction After studying this section, you will (a) understand what is meant by "electromagnetic induction" and (b), know the principles behind the operation of the dynamo and the transformer. This is achieved if the direction of the induced current creates a south pole at the end of the solenoid closest to the departing magnet, as the induced south pole tends to attract the departing north pole. When a coil of conducting wire is rotated in a magnetic field, electromagnetic induction results in an induced current flowing through the loop. www.physchem.co.za /Current10/Magnetic3.htm   (676 words)

 Electromagnetic Induction A quantitative measure of the strength of the magnetic field B present in a region, is given by the concept of the magnetic flux. The above expression is known as Faraday's law of electromagnetic induction. By Faraday's law of induction, this means a change in the flux. www2.potsdam.edu /islamma/Phys305_Induction.htm   (1561 words)

 Borehole Electromagnetics   (Site not responding. Last check: 2007-10-14) By theoretically analyzing the tri-axial induction instrument for its response to the magnetic field components induced in the conductive medium, we derived low frequency approximations for the quadrature components of our induction tensor. The modeling of the tensor induction tool response in layered anisotropic media was based on an Electromagnetic Green's Tensors Library GT3D, developed by CEMI (EM Green's tensor library for horizontally layered anisotropic medium). The conventional induction logging instrument (with the transmitter and receiver oriented along the borehole) usually provides an image of the resistivity distribution that is axially symmetrical with respect to the borehole axis. www.mines.utah.edu /~wmcemi/appls/bhole/index.html   (1784 words)

 An Electromagnetic Induction Experiment   (Site not responding. Last check: 2007-10-14) Faraday's law of induction and its consequences are most often introduced in introductory physics and introductory electricity and magnetism classes. This paper consists of an experimental and theoretical investigation of an apparatus which is used as a lecture demonstration of the principles of induction. Although Faraday's law of induction and Lenz's law are used to explain the retardation of the passage of the magnet through the pipe, data are rarely taken and analyzed. www.pha.jhu.edu /~mstone/induct/induc/induc.html   (179 words)

 Electromagnetic Induction (EM)   (Site not responding. Last check: 2007-10-14) Electromagnetic induction measures subsurface conductivity of soil, groundwater, and rock. Electromagnetic induction surveys are rapid and very accurate. The company principals have over 40 years of combined experience and have conducted numerous electromagnetic induction (EM) surveys worldwide. www.geomodel.com /ind   (120 words)

 Chapter 21: Electromagnetic Induction and Faraday's Law   (Site not responding. Last check: 2007-10-14) Write Faraday's Law of Induction and apply it to induced emf through a loop. Induction, Faraday's law, Lenz's law, and induced emf require two blocks. Determine the magnitude and the direction of the induced current in the loop when (b) the leading front half of the loop enters the field, (c) the entire loop is in the field, and (d) the leading front of the loop has left the field. www.wilsonhs.org /benjamin/apphyemind.htm   (640 words)

 Rare-Earth Magnets - Electromagnetic Induction While Oersted's surprising discovery of electromagnetism paved the way for more practical applications of electricity, it was Michael Faraday who gave us the key to the practical generation of electricity: electromagnetic induction. Faraday discovered that a voltage would be generated across a length of wire if that wire was exposed to a perpendicular magnetic field flux of changing intensity. This phenomenon is put into obvious practical use in the construction of electrical generators, which use mechanical power to move a magnetic field past coils of wire to generate voltage. www.rareearth.org /electromagnetic_induction.htm   (466 words)

 Electromagnetic Induction Electromagnetic induction (EM), also called Terrain Conductivity, allows for the rapid collection and interpretation of large quantities of data, making it a cost effective technique. Electromagnetic induction is also unsuitable for locating small isolated objects on a large site. We can provide you with an accurate assessment of your requirements to determine whether or not the use of electromagnetic induction is appropriate at a particular site. www.hager-richter.com /em.htm   (439 words)

 [No title] B= F / IL The field strength is actually called "Magnetic Induction." B is the magnetic induction, sometimes called the "B field." The unit of magnetic induction is the telsa (T). F is force (as usual), B is the magnetic induction, q is charge, and v is velocity. EMF in volts equals the magnetic induction times the length of wire times the velocity of the wire. library.thinkquest.org /13526/c3c.htm   (1546 words)

 Sensors for Information Gathering Two methods are available nowadays to measure bulk EC on-the-go: the electromagnetic induction and the direct EC measurement method. The device is composed of a transmitter and a receiver coil installed usually 1.0 m (3.3 ft) apart in a non-conductive (wooden) bar in the opposite ends of the instrument (Fig. The ratio of the secondary to the primary magnetic field is proportional to the ground conductivity of the soil (McNeill, 1980; Sudduth et al., 1993). www.precisionag.org /html/ch10.html   (3831 words)

 Lectures 13 and 14 Electromagnetic induction   (Site not responding. Last check: 2007-10-14) It is reasonable to guess that there might be the reverse effect: if a wire is passed through a magnetic field then a current is produced. This effect, known as electromagnetic induction, was discovered in 1831-1832 during a series of experiments by Michael Faraday. This result can be shown to be a general one which applies to all types of electromagnetic induction (not just motional). www.shef.ac.uk /physics/teaching/phy205/lectures13_and_14.htm   (1144 words)

 Educational kits - electromagnetic induction The Pico Magnetic Induction Kit provides a simple and effective method for students to investigate the concepts of Faraday's laws of electromagnetic induction. The Magnetic Induction Kit can be used to demonstrate electromagnetic induction, the direction of induced currents and variation of the size of induced emf with velocity. On 29th August 1831, using his “induction ring”, Faraday made one of his greatest discoveries — electromagnetic induction: the "induction" or generation of electricity in a wire by means of the electromagnetic effect of a current in another wire. www.picotech.com /education/magnetic_induction.html   (382 words)

 Electromagnetic Induction   (Site not responding. Last check: 2007-10-14) Because of the laws of electromagnetic induction, this changing magnetic field must in turn create a changing electric field in the space surrounding the inductor. So, the electric field created by induction acts on the charged sphere (F = Eq) but the electric field of the charged sphere has nothing to act on in return. Since EM induction is such a well known area of electromagnetism, my assumption is that this must not be the case. www.newton.dep.anl.gov /askasci/phy99/phy99x32.htm   (459 words)

 Measuring Nutrient Buildup With Electromagnetic Induction In Clay Center, Nebraska, at the Roman L. Hruska U.S. Meat Animal Research Center, Eigenberg studies nutrient movement in several fields by use of electromagnetic induction (EI). He uses various instruments to do this, including one that looks like an oversized sled, which is pulled by an all-terrain vehicle or a human when the crop is too tall. "Measuring Nutrient Buildup With Electromagnetic Induction" was published in the September 2004 issue of Agricultural Research magazine. www.ars.usda.gov /is/AR/archive/sep04/electro0904.htm   (517 words)

 Physics 30: Electromagnetic Induction Electromagnetic induction results in a temporary change in the external magnetic field. Use Faraday's iron ring, or some other apparatus, to demonstrate electromagnetic induction. Moving a conductor through the jaws of a horseshoe magnet, or plunging a bar magnet into and out of a solenoid connected to a galvanometer, are interesting ways in which to observe this. www.sasked.gov.sk.ca /docs/physics/u7d3phy.html   (516 words)

 Gravitational Induction of Electromagnetic Waves Gravitational Induction of an Electromagnetic Wave on a Ball-of-Light If one ball-of-light moved past another ball-of-light at relatively long distances at relatively low speeds, it is still possible that new electromagnetic fields would be induced on each particle due to gravity. Gravitational Induction of an Electromagnetic Wave on the Core of a Star www.grandunification.com /hypertext/GravInductEMWave.html   (1545 words)

 Electromagnetic Induction, Faraday's Laws, AC Circuits   (Site not responding. Last check: 2007-10-14) Output AC current can be converted to DC current by replacing the slip rings by split-ring commutators. The changing electromagnetic field induces the output current. Motor is the opposite of generator: current in the loop created by emf source, the current interacts with existing magnet to create torque. physics.usc.edu /~bars/135/LectureNotes/EMinduction.html   (599 words)

 Unit V: Chapter 37: Learning Links Find out about eddy currents and electromagnetic induction in this Exploratorium activity. Electromagnetic Induction is one of the many topics in this lesson from the student-created site Live the Physics. Learn all about electromagnetic waves in this chapter from the Physics 2000 online physics tutorial. www.phschool.com /science/cpsurf/elec-mag/5_37lear.html   (258 words)

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