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Topic: Magnetic induction

Related Topics

Magnetic flux

Magnetic field

Electromagnetic field

Magnetism

Electromotive force

Inductance

Gauss

Induction coil

Induction motor

Electric field

Coil

Magnetic field density

Transformer

Emf

Henry (inductance)

	Electric field/Magnetic induction: Definition
		It is exactly the same for electric field and magnetic induction: the intensity of the field is significant near its source, and decreases rapidly as one moves away from it.
		However the magnetic induction that we usually measure are in the range of the microtesla (µT), that is to say, one millionth of a tesla.
		The magnetic permeability of a material is the capability of this material to channel magnetic induction, in other words, to concentrate magnetic flux lines and thus to increase the value of magnetic induction.
	www.bbemg.ulg.ac.be /UK/2Basis/efmf.html (605 words)

	Tengam Engineering, Inc. ::: Magnetic Glossary
		Magnetic induction is the flux per unit area normal to the direction of the magnetic path.
		The average value of magnetic induction over the area of the air gap, Ag; or it is the magnetic induction measured at a specific point within the air gap; measured in Gauss.
		The north pole of a magnet, or compass, is attracted toward the north geographic pole of the earth (which is actually, by definition, a magnetic south pole), and the south pole of a magnet is attracted toward the south geographic pole of the earth.
	www.tengam.com /html/magnetic.html (1783 words)

	Induction Heating Systems Questions answered by RDO Induction.
		The varying magnetic field required for induction heating is developed in the induction heating coil via the flow of AC (alternating current) in the coil.
		Induction heating can also heat the part in a highly localized fashion, which can be extremely beneficial when it is desirable or necessary to limit the heat to only a certain region of the part.
		Since the induction coil is not in any contact with the part being heated and the part is being presented to the coil in a consistent fashion, the process will remain repeatable, unlike traditional flame heating or resistance heating, which have constantly changing characteristics.
	www.rdoinduction.com /induction_faqs.htm (1001 words)

	Definitions & Glossary of Terms - Neodymium magnets, Samarium cobalt magnets, Magnet assemblies, Magnetic components
		Magnetizing or demagnetizing force, is the measure of the vector magnetic quantity that determines the ability of an electric current, or a magnetic body, to induce a magnetic field at a given point; measured in oersteds.
		The ratio of the length of a magnet to its diameter, or the diameter of a circle of equivalent cross-sectional area.
		It is the ratio between the magnetic flux at the magnet neutral section and the average flux present in the air gap.
	www.mceproducts.com /knowledge-base/glossary (1717 words)

	Glossary of Magnet Terminology
		This is the point at which the hysteresis loop crosses the B axis at zero magnetizing force, and represents the maximum flux output from the given magnet material.
		Magnetic Field Strength (H) - Magnetizing or demagnetizing force, is the measure of the vector magnetic quantity that determines the ability of an electric current, or a magnetic body, to induce a magnetic field at a given point; measured in Oersteds.
		North Pole - The north pole of a magnet is the one attracted to the magnetic north pole of the earth.
	www.kjmagnetics.com /glossary.asp (2440 words)

	Magnetic Induction (Site not responding. Last check: 2007-10-12)
		When a bar magnet is brought near a closed loop of wire (a conducting ring), an electrical current is induced to flow around the loop.
		If the bar magnet is moved by hand, a very small resistive force is felt no matter which way it is moved: in fact, this is required since energy is conserved-- mechanical work must be done against resisting force (drag) if current is to be induced in the loop.
		Besides this case, other ways to change magnetic flux through the loop include translating the loop rather than the magnet, rotating the loop, and changing the size or shape of the loop.
	www.sage.edu /faculty/vozzof/genphys2/induction.html (464 words)

	Induction Cooktops
		Magnetic induction cooking uses electricity to produce a magnetic field that sends currents into iron atoms that react by movement which causes friction and heat in a metal vessel.
		Cooking with magnetic induction is 90 percent efficient, as compared to resistance electric at approximately 65-percent efficiency, and open-flamed gas which measures in the 55-percent efficiency range.
		Magnetic induction relies on cooking with vessels that can be magnetized, so glass and copper pots are not suited to this cooking method, but other commonly used cookware made of steel or iron works fine.
	www.toolbase.org /Technology-Inventory/Appliances/induction-cooktops (705 words)

	PowerPedia:Magnetic field - PESWiki
		Thus, using special relativity, magnetic forces are a manifestation of electrostatic forces of charges in motion and may be predicted from knowledge of the electrostatic forces and the velocity of movement (relative to some observer) of the charges.
		The "north" and "south" poles of a magnet or a magnetic dipole are labelled similarly to north and south poles of a compass needle.
		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.
	peswiki.com /index.php/PowerPedia:Magnetic_field (3055 words)

	Magnetic induction hearing aid - Patent 4800884
		A magnet is attached to portions of the middle ear by means of a malleus clip or by implantation between the tympanic membrane and the malleus.
		To aid generation of the rocking action of the magnet 32, it is preferable that the coil axis be at an angle, preferably 45 degrees, to the plane of the magnet 32.
		The mass of the magnet 32 must be kept at a minimum to further increase the efficiency of the design so that the coil's magnetic field does not have to oscillate a larger mass and therefore require a larger energy transfer between the coil 28 and the magnet 32.
	www.freepatentsonline.com /4800884.html (4522 words)

	magnetic glossary,magnetic terminology,
		The permanent magnets with the high intrinsic coercive force are called permanent magnets, that usually are associated with a high stability of temperature.
		it is the magnetic induction that remains in a magnetic circuit after the removal of an application, magnetizing the force.
		it is the value of the induction in a point of the hysteresis loop, to whom the hysteresis wrap crosses up, the one of the B axis to zero that magnetizes the force.
	www.ndfeb-magnet.cn /GLOSSARY.HTM (587 words)

	Measuring Magnetic Gauss
		Magnets used for biomagnetic purposes are described as open-circuit magnets because they do not have supplemental ferromagnetic parts to provide a complete path for the magnetic energy.
		The flux density on the surface of this magnet, measured using a gauss meter, is 985 gauss.
		The flux density on the surface of the magnet, measured using a gauss meter, is 565 gauss.
	www.magnetictherapymagnets.com /gaussmeter.html (1298 words)

	Table of Contents
		In the second part of Equation 1, the mo is the permeability in a vacuum, H is the magnetic field due to the solenoid, and the M is the magnetization of the material (or the change in the flux due to the applied magnetic field).
		So to increase the induction in hard magnets a lot more energy needs to be supplied, which incidentally corresponds to the area within the hysteresis loop.
		Also note that magnetic induction increases more if there are inclusions or impurities in a material as opposed to a pure material.
	www.iit.edu /~erdmsco/Magnets/introduction.htm (957 words)

	Coating thickness measurement - Non-destructive Dry and Wet Film Thickness
		Magnetic film gages are used to nondestructively measure the thickness of a nonmagnetic coating on ferrous substrates.
		A magnet is attached to one end of a pivoting balanced arm and connected to a calibrated hairspring.
		Magnetic induction instruments use a permanent magnet as the source of the magnetic field.
	www.defelsko.com /technotes/coating_thickness_measurement.htm (2121 words)

	Kiss the Cooktop: Magnetic Induction Cooking Technology A "Cool" Alternative to Radiant Heat - All the POWER without ...
		The technology of using magnetic induction for cooking is not new, but after American appliance manufacturers gave up on induction several years ago, it's a big deal to have a North American alternative back as a player in the residential induction cooking market.
		Induction works by passing an alternating currant through coils made of ferromagnetic material (magnetic metal) contained in the stove's hobs (area where the cooking vessel sits).
		Induction cooking is also highly efficient (85 to 90 percent efficiency compared to gas at 43 percent and electric at 44 percent efficiency).
	www.divainduction.com /articles.php?article=1 (1230 words)

	Magnets attracting wireless attention \| CNET News.com
		Magnets are beginning to gain the attention of home-electronics manufacturers and government agencies as an alternative to Bluetooth and other short-range wireless techniques.
		At the heart of the new interest in what's known as "magnetic induction" is Aura, or so claims the nine-year-old chipmaker, founded by a group of Massachusetts Institute of Technology graduates.
		Magnetic induction differs from Bluetooth and just about every other wireless technique now available, most of which use what's known as radio frequency, or RF, signals--bursts of electrical energy that waft out like ripples in a pond until they reach an antenna.
	news.com.com /2100-1039_3-5079564.html (783 words)

	HAARP Induction Magnetometer (Site not responding. Last check: 2007-10-12)
		The induction magnetometer detects temporal variation of the geomagnetic field based on Faraday's law of magnetic induction.
		The magnetic flux density is enhanced by a factor of approximately 1,000 by the high-permeability metal core.
		The magnetometer sensors are aligned along the magnetic north, magnetic east and vertical directions to form an orthogonal measure of the derivative of the field.
	www.haarp.alaska.edu /haarp/magind.html (426 words)

	Fluxtrol Inc.- Induction Heating Magnetic Flux Concentrators
		On the contrary, HL may be the main part of losses in magnetic flux controllers made of ferrites, laminations or magnetodielectric materials (magnetic composites).
		Magnetic flux may be compared to a flow rate of liquid.
		In a magnetic circuit, ampere-turns of the coil (driving force for magnetic flux) push magnetic flux through the reluctance of a certain area.
	www.fluxtrol.com /index.asp?pgid=46 (1901 words)

	Lines of Force
		The magnetic lines of force are assumed to emanate from the north pole of a magnet, pass through surrounding space, and enter the south pole.
		With the knowledge of magnetic fields and magnetic lines of force developed up to this point, it is simple to understand the manner in which a material becomes magnetized when brought near a magnet.
		Since magnetic lines of force travel inside a magnet from the south pole to the north pole, the nail will be magnetized in such a polarity that its south pole will be adjacent to the north pole of the bar magnet.
	www.tpub.com /neets/book1/chapter1/1i.htm (898 words)

	Fluxtrol Inc. — Induction Heating Magnetic Flux Concentrators
		Induction Heating is an electromagnetic heating method of electrically conductive bodies, which absorb energy from an alternating magnetic field, generated by induction coil (inductor).
		Induction heating is caused by the thermal effect of strong eddy currents induced by magnetic alternating flux.
		They are used for magnetic flux control (concentrating, shielding or modifying), essentially capturing the alternating magnetic field and re-directing or focusing it to the desired area of the workpiece (or part).
	www.fluxtrol.com /index.asp?pgid=12 (576 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.
		If a magnetic flux through a loop of wire is increasing in time, the resulting induced current generated in the loop must be directed so as to oppose the incresing flux.
		The direction of magnetic field present is normal to the plane of the coil.
	www2.potsdam.edu /islamma/Phys305_Induction.htm (1561 words)

	Magnetism
		Magnetic fields are historically described in terms of their effect on electric charges.
		The north pole of a magnet is the pole that aligns itself with geographic north.
		Elementary physics states that the magnetic field of a magnetic dipole is approximately proportional to the inverse cube of the distance from the dipole.
	www.theverylastpageoftheinternet.com /magneticExp/adsitt/magnetism.htm (2084 words)

	Magnetic induction: A low-power wireless alternative
		Magnetic systems use design techniques that cannot be used at 2.4 GHz, resulting in less power consumption through the chain and a smaller component count.
		The magnetic induction system is constant power at a given distance to the transmitter and is not generally affected by environment.
		Magnetic solutions are about 1/3 the cost of the RF solution and require about 10 to 30 times less power.
	rfdesign.com /mag/radio_magnetic_induction_lowpower (1498 words)

	Educational kits - electromagnetic induction
		A small bar magnet is dropped down the tube and, as it passes through the coil, an electromotive force (emf) is induced.
		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)

	Magnetic Induction (Site not responding. Last check: 2007-10-12)
		That energy is stored in the magnetic field of the inductor; this section finds an equation to calculate the total energy stored in the inductor.
		is the magnetic flux through the coil and N is the total number of turns.
		This energy is the magnetic counterpart to the energy stored in the electric field of a charged capacitor.
	www.uccs.edu /~rtirado/pes112ch28MagneticInduction.htm (720 words)

	Short-range magnetic induction for personal wireless consumer electronics
		One characteristic of particular interest, at least as it relates to magnetic communication, is the roll-off behavior as a function of distance.
		Compare this to a quasi-static magnetic field where the roll-off is 1/r6.
		Magnetic fields reliably follow the 1/ r6 behavior regardless of the presence of metal objects, conductive materials, or people.
	www.auracomm.com /site/content/roll_off.asp (276 words)

	More Info on Magnetic Induction (Site not responding. Last check: 2007-10-12)
		The magnitude of the field depends on the magnitude of the charge, the speed of motion of the charge (the first right hand rule), and the angle between the velocity of the charge and the radius vector from the point where the field is being observed to the charge.
		The magnitude of the electromagnetic force on a moving charge is proportional to the magnitude of the charge on the moving particle, the strength of the magnetic field through which it moves, the speed at which the charge is moving relative to the field, and the angle between the velocity and the field.
		The magnetic field around a wire carrying a current has a simple geometry, and the extension of this idea to coils of wires can be developed.
	dev.nsta.org /ssc/moreinfo.asp?id=1035 (377 words)

	The Open Door Web Site : IB Physics : Questions : Electro-Magnetic Induction
		A circular coil having 20 turns is placed in a uniform magnetic field of flux density 0·2T.
		The angle between the plane of the coil and the field is 30° and the radius of the coil is 5cm.
		The magnitude of the vertical component of the flux density of the earth’s magnetic field surrounding the aircraft is 1×10
	www.saburchill.com /physics/questions/quest023.html (522 words)

	Magnetic Induction (Site not responding. Last check: 2007-10-12)
		When a magnetic material, say iron, is placed within a magnetic field, H, the magnetic material will produce its own magnetization.
		In practice, the induced magnetic field (that is, the one produced by the magnetic material) will look like it is being created by a series of magnetic dipoles located within the magnetic material and oriented parallel to the direction of the inducing field, H.
		The strength of the magnetic field induced from the magnetic material by the inducing field is is called the intensity of magnetization, I.
	gretchen.geo.rpi.edu /roecker/AppGeo96/lectures/mag/induced.html (88 words)

	The Tartan Online : How Things Work: Magnetic Induction Cooktops
		By varying the strength of the magnetic field, the heat generated in the pot is varied almost instantly.
		Induction stoves average about 80 percent energy efficiency, compared to about 50 percent efficiency for conventional electric stoves and 30 percent efficiency for gas stoves.
		If a magnet can stick to your current cookware, it is “induction ready.” If not, get ready to stock up on stock pots.
	www.thetartan.org /2006/2/27/scitech/howthingswork (731 words)

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