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Topic: Permeability electromagnetism

	Permeability - Wikipedia, the free encyclopedia
		Permeability (electromagnetism), in electromagnetism, is the degree of magnetisation of a material in response to a magnetic field.
		Permeability (geology) in geology, is a measure of the ability of a material to transmit fluids through it.
		Vascular permeability, the movement of fluids and molecules between the vascular and extravascular compartments.
	en.wikipedia.org /wiki/Permeability (131 words)

	Electromagnetism - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-09-29)
		Electromagnetism is the physics of the electromagnetic field: a field, encompassing all of space, composed of the electric field and the magnetic field.
		An accurate theory of electromagnetism, known as classical electromagnetism, was developed by various physicists over the course of the 19th century, culminating in the work of James Clerk Maxwell, who unified the preceding developments into a single theory and discovered the electromagnetic nature of light.
		In classical electromagnetism, the electromagnetic field obeys a set of equations known as Maxwell's equations, and the electromagnetic force is given by the Lorentz force law.
	encyclopedia.worldsearch.com /electromagnetism.htm (804 words)

	MAGNETIC PERMEABILITY - LoveToKnow Article on MAGNETIC PERMEABILITY (Site not responding. Last check: 2007-09-29)
		The permeability of a metal belonging to the ferromagnetic classiron, nickel, cobalt and some of their alloysis a function of the magnetic force, and also depends upon the previous magnetic history of the specimen.
		The Perm zemstvo or provincial council is one of the most active in Russia in promoting the spread of education and agricultural knowledge among the peasants.
		The government is intersected by a railway from Perm eastwards across the Urals, and thence southwards along their eastern slope to Ekaterinburg, Chelyabinsk (main Siberian trunk line) and Tyumen; also by a railway from Perm to Kotlas, at the head of the Northern Dvina.
	www.1911encyclopedia.org /P/PE/PERMEABILITY_MAGNETIC.htm (959 words)

	ELECTROMAGNETISM - LoveToKnow Article on ELECTROMAGNETISM (Site not responding. Last check: 2007-09-29)
		He then found that such an electromagnet wound with a long fine wire, if worked with a battery consisting of a large number of cells in series, could be operated at a considerable distance, and he thus produced what were called at that time intensity electromagnets, and which subsequently rendered the electric telegraph a possibility.
		The Magnetic Circuit.The phenomena presented by the electromagnet are interpreted by the aid of the notion of the magnetic circuit.
		The magnetic permeability of cast iron is much inferior to that of wrought or ingot-iron, or the mild steels taken at the same flux densities.
	73.1911encyclopedia.org /E/EL/ELECTROMAGNETISM.htm (7035 words)

	Permeability (electromagnetism) - Wikipedia, the free encyclopedia
		In electromagnetism, permeability is the degree of magnetisation of a material that responds linearly to an applied magnetic field.
		Magnetic permeability is represented by the symbol μ.
		In SI units, permeability is measured in henrys per metre.
	en.wikipedia.org /wiki/Permeability_(electromagnetism) (378 words)

	Electromagnetism Online Research :: Information about Electromagnetism (Site not responding. Last check: 2007-09-29)
		The term "electromagnetism" comes from the fact that the electric and magnetic fields are closely intertwined, and, under most circumstances, it is impossible to consider the two separately.
		The term electrodynamics is sometimes used to refer to the combination of electromagnetism with Mechanics and deals with the effects of the electromagnetic field on the dynamic behavior of electrically charged particles.
		In classical electromagnetism, the electromagnetic field obeys a set of equations known as Maxwell's equations, and the electromagnetic force is given by the Lorentz force.
	in-northcarolina.com /search/Electromagnetism.html (1075 words)

	Encyclopedia: Permeability (electromagnetism)
		Î¼ is the permeability, measured in henries per metre The henry (symbol H) is the SI unit of inductance.
		B is the magnetic flux density (also called the magnetic induction) in the material, measured in teslas Magnetic field density, otherwise known as magnetic flux density, is essentially what the layman knows as a magnetic field - akin to a gravitational or electric field.
		An electromagnet is a type of magnet in which the magnetic field is induced by a flow of electric current.
	www.nationmaster.com /encyclopedia/Permeability-(electromagnetism) (1087 words)

	Electomagnetism.
		The ratio of the flux density B to the magnetic field strength H in vacuum is called the permeability of free space.
		The value of permeability for air and for many non-magnetic materials is almost the same as that of free space.
		The ratio of the flux density with a core to that without, for the same magnetic field strength, is called the relative permeability.
	www.hills2.u-net.com /electron/elecmag.htm (590 words)

	[No title] (Site not responding. Last check: 2007-09-29)
		A laboratory device for measurement of permeability of materials, for example, soil or rocks; consists of a powder bed of known dimension and degree of packing through which the particles are forced; pressure drop and rate of flow are related to particle size, and pressure drop is related to surface area.
		A device for measuring the coefficient of permeability by measuring the flow of fluid through a sample across which there is a pressure drop produced by gravity.
		It is estimated to have triggered the extinction of 85% or more of all ocean species, approximately 70% of land vertebrates, and significant extinctions of plants and insects.
	www.accessscience.com /Dictionary/P/P15/DictP15.html (2442 words)

	Open Directory - Science: Physics: Electromagnetism (Site not responding. Last check: 2007-09-29)
		Differential Forms in Electromagnetic Theory - The differential forms research group at BYU is investigating the use of the calculus of differential forms in teaching and research.
		Electromagnetic Inertia - Derivation and proof of the inertial properties of electrostatic and magnetostatic fields.
		Electromagnetic spectrum redefined - Bharat radiation from excited atoms of radioisotopes and XRF sources is a new part of electromagnetic spectrum.
	dmoz.org /Science/Physics/Electromagnetism (930 words)

	Magnetic properties of materials
		At an atomic level ferromagnetism is explained by a tendency for neighbouring atomic magnetic moments to become locked in parallel with their neighbours.
		The term 'relative' arises because this permeability is defined in relation to the permeability of a vacuum,
		Effective permeability is seen in some data sheets for cores which have air gaps.
	www.ee.surrey.ac.uk /Workshop/advice/coils/mu (3813 words)

	Magnetism: quantities, units and relationships
		permeability is high, then the error will be small.
		This is all a bit approximate; but bear in mind that since manufacturing tolerances on permeability are often 25% there isn't much point in being more exact.
		permeability core is used, inductance is usually determined from the
	www.ee.surrey.ac.uk /Workshop/advice/coils/terms.html (3382 words)

	Lessons In Electric Circuits -- Volume I (DC) - Chapter 14
		An electromagnet is a piece of wire intended to generate a magnetic field with the passage of electric current through it.
		Though all current-carrying conductors produce magnetic fields, an electromagnet is usually constructed in such a way as to maximize the strength of the magnetic field it produces for a special purpose.
		Permeability -- The specific measure of a material's acceptance of magnetic flux, analogous to the specific resistance of a conductive material (ρ), except inverse (greater permeability means easier passage of magnetic flux, whereas greater specific resistance means more difficult passage of electric current).
	www.ibiblio.org /obp/electricCircuits/DC/DC_14.html (4079 words)

	Electromagnetism \| TutorGig.co.uk Dictionary (Site not responding. Last check: 2007-09-29)
		Formerly believed to be separate phenomena, electricity and magnetism were shown by experiment and theory to be different aspects of the electromagnetic force.
		It is responsible for the forces generated between magnetically or electrically charged objects, and is the fundamental force responsible for the characteristics of electromagnetic radiation, including light.
		electromagnetism n 1: magnetism produced by an electric current; "electromagnetism was discovered when it was observed that a copper wire carrying an electric current can magnetize pieces of iron or steel near it" 2: the branch of physics concerned with electromagnetic phenomena [syn: electromagnetics]
	www.tutorgig.co.uk /dict.jsp?keywords=Electromagnetism (253 words)

	[No title]
		] An auxiliary vector field, used in describing magnetic phenomena, whose curl, in the case of static charges and currents, equals (in meter-kilogram-second units) the free current density vector, independent of the magnetic permeability of the material.
		] A flaw detector in which a ferrous object is magnetized with an electromagnet or permanent magnet and sprayed with magnetic particles or a solution containing fine suspended magnetic particles which outline surface or near-surface flaws.
		] A magnetic field with axial symmetry, capable of converging beams of charged particles of uniform velocity and of forming images of objects placed in the path of such beams; the field may be produced by solenoids, electromagnets, or permanent magnets.
	www.accessscience.com /Dictionary/M/M4/DictM4.html (2830 words)

	Permeability (Site not responding. Last check: 2007-09-29)
		'''Permeability''' has several meanings: In electromagnetism, permeability is the degree of magnetisation of a material in response to a magnetic field.
		In geology, permeability is a measure of the ability of a material to transmit fluids through it.
		See also Permeability tensor for materials that are not isotropic.
	permeability.iqnaut.net (82 words)

	Journal of Theoretics
		The main objective of this paper is to show that every electromagnetic field is coupled to a gravitoelectric-gravitomagnetic field and that induction between both fields is possible.
		However, electromagnetism is associated with available wide ranges of frequencies, currents and potentials and is therefore more "engineerable" than the handling of heavy masses.
		Hence, using electromagnetic fields to induce non-Newtonian gravitational fields is an issue closely related to material sciences, cryogenic technology and extremely high frequency problems.
	www.journaloftheoretics.com /Articles/3-1/tajmar-final.htm (2435 words)

	Ampere articles and news from Start Learning Now (Site not responding. Last check: 2007-09-29)
		The ampere (symbol: A) is the SI base unit of electrical Current (electricity)current equal to one coulomb per second.
		It is named after AndrÃ©-Marie AmpÃ¨re, one of the main discoverers of electromagnetism.
		Prior to 1948, the so-called "international ampere" was used, defined in terms of the electrolysiselectrolytic deposition rate of silver.
	www.startlearningnow.com /ampere.htm (660 words)

	iqexpand.com (Site not responding. Last check: 2007-09-29)
		Relative permeability is the ratio of effective permeability of a particular fluid at a particular saturation to absolute...
		The magnetic permeability of free space is taken to have the exact value See also relative...
		We are the world leader in permeability and solubility measurement We provide instruments and analytical services for solubility, permeability, dissolution, pK a and log P determination Please also visit...
	permeability.iqexpand.com (364 words)

	Electromagnetism (Site not responding. Last check: 2007-09-29)
		Mathematically, it is the ratio of the flux density (B) to the magnetizing force (H) that causes B. In Symbols
		This induces an electromagnetic force in the winding.
		The magnitude of this force is proportional to the number of turns and the speed of the alternating flux.
	leeh.ee.tut.fi /transformer/tra11.htm (504 words)

	Electromagnetic Permeability of the Vacuum and Light-Cone Structure (Site not responding. Last check: 2007-09-29)
		Electromagnetic Permeability of the Vacuum and Light-Cone Structure
		During our meetings and excursions we discussed many topics, but I was mostly interested in the problems of fibre bundles, gauge theories, meaning of electromagnetic potentials, and also conformal invariance of electromagnetism.
		The question is important because light-cone structure determines nine of the ten components of the metric tensor.
	quantumfuture.net /quantum_future/emp.htm (550 words)

	Physics 30: Electromagnetism
		Magnetic permeability (µ) is the ratio of magnetic field strength with a particular core material to the magnetic field strength without that core material, in a vacuum.
		Apply the right-hand rule for a solenoid to determine the direction of the current through the coil or the magnetic polarity of the coil.
		If an electromagnet can be set up for this demonstration, it not only helps to remove the iron filings, but it can also be used to illustrate the collapse of the magnetic field when the current to the electromagnet is discontinued.
	www.sasked.gov.sk.ca /docs/physics/u7b3phy.html (1044 words)

	Read about Permeability (electromagnetism) at WorldVillage Encyclopedia. Research Permeability (electromagnetism) and ... (Site not responding. Last check: 2007-09-29)
		Research Permeability (electromagnetism) and learn about Permeability (electromagnetism) here!
		electromagnetism, permeability is the degree of magnetisation of a material that responds linearly to a magnetic field.
		Absolute permeability (the magnetic constant) is represented by the symbol
	encyclopedia.worldvillage.com /s/b/Permeability_(electromagnetism) (197 words)

	The Greek Alphabet in Science, Technology & Maths quiz
		In the lower case, it is used to represent a photon (in layman's terms, a "packet" of electromagnetic energy), as well as a high-energy form of electromagnetic radiation.
		The fourth in the Greek alphabet, this letter is used to express a change or difference in values, in the upper case.
		This letter also the symbol used to represent the coefficient of friction between two surfaces, and permeability in electromagnetism.
	www.funtrivia.com /playquiz/quiz2009911703b90.html (781 words)

	Electromagnetism - electromagnetism.com: The Leading Science Site on the Net (Site not responding. Last check: 2007-09-29)
		One of the most useful features of electromagnetism was the ac current generator.
		Electromagnetism is important for the operation of wind turbine generators.
		New Electromagnetism is an improved set of models describing electromagnetic interactions.
	www.findoutsite.com /fos/electromagnetism.htm (284 words)

	Electromagnetism
		However, the effect of magnetic fields on atoms and molecules is used widely in all manner of spectroscopies, and we will need to appreciate magnetic behaviour in order to understand the interaction of light and other electromagnetic radiation with atoms and molecules.
		We are now in a position which will allow us, at least qualitatively, to describe the origins of electromagnetic radiation and its interaction with atoms and molecules.
		The complete theory predicts that the resultant electromagnetic wave at P travels in the x direction and has transverse oscillations in the z direction of the electric field and in the y direction of the magnetic field and that these are in phase.
	www.ch.ic.ac.uk /local/physical/mi_5.html (2985 words)

	Chapter 2 - Advanced Topics : Electromagnetism
		A. Calculate the magnetic field strength at the centre of the coil.
		In other words, permeability of a magnetic material is much greater than permeability of free space.
		The relative permeability of a magnetic material is not constant, it depends on the field strength.
	linux.semple.edu.hk /~laukc/S.7AL_Phys/S6electronics/E_course/ch2/magnet.htm (702 words)

	Electromagnetism from LiveJournal (Site not responding. Last check: 2007-09-29)
		He elegantly combined electricity and magnetism into a unified theory of Electromagnetism and its interaction with time and space.
		I don't like this idea considering Thursdays are already our busiest day and they didn't even attempt to move it to a different day, say Tuesday, where we don't have any Chem at all.
		I skipped Differential Equations and Electromagnetism today in order to focus on the two exams I had for Ancient Warfare in the Greek World and Linear Algebra.
	www.ljseek.com /search/Electromagnetism (739 words)

	Coherence
		In view of electromagnetism, modern concepts of polarization do not make a lot of sense.
		If the field of a photon were in a single direction, it would have to spread as it propagated.
		As a practical matter of including the effects of polarization or magnetization of materials, a different permittivity and/or permeability can be used to calculate the resulting effects, but the intrinsic permittivity and permeability of space is not changed.
	home.netcom.com /~heensle/phys/book/coher.html (937 words)

	lectures
		The electromagnetic field due to a uniformly moving charge
		The electromagnetic field due to an accelerated charge
		The propagation of electromagnetic radiation through a dispersive medium
	farside.ph.utexas.edu /teaching/jk1/lectures/lectures.html (98 words)

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