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Topic: Magnetic field strength

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	What is magnetic field strength? - a definition from Whatis.com
		Magnetic field strength is defined as the mechanical force (newton) on a wire of unit length (m) with unit electric current(A).
		The older units for the magnetic flux, maxwell = 10-8 weber, and for the magnetic flux density, gauss (or oerstedt) = maxwell / cm2 = 10-4 tesla, are not to be used anymore.
		Magnetic flux density diminishes with increasing distance from a straight current-carrying wire or a straight line connecting a pair of magnetic poles around which the magnetic field is stable.
	searchsmb.techtarget.com /sDefinition/0,290660,sid44_gci763586,00.html (382 words)

	Glossary of Magnet Terminology
		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.
		Magnetic induction is the flux per unit area normal to the direction of the magnetic path.
		Surface Field (Surface Gauss) - The magnetic field strength at the surface of the magnet as measured by a Gauss meter.
	www.kjmagnetics.com /glossary.asp (2435 words)

	NationMaster - Encyclopedia: Woofer (Site not responding. Last check: 2007-10-24)
		Nearly all woofers are driven by a voice coil in a magnetic field, and they typically have a diameter of 5 to 18 inches (125 to 460 mm).
		The resonant frequency of the woofer is determined by the compliance (flexibility) of the cone suspension, the mass of the cone, the magnetic field strength, and the air resistance behind it.
		Resonant frequency is one of a woofer's parameters and is determined by the compliance (flexibility) of the cone suspension, the mass of the cone, the magnetic field strength and the air resistance behind it.
	www.nationmaster.com /encyclopedia/Woofer (679 words)

	Rare earth magnets for fun and profit
		The field extending from these magnets doesn't reach far with any strength, because the smaller a magnet of a given intrinsic strength is, the smaller will be the volume of space it can fill with a magnetic field of a given strength.
		Magnetic field strength drops off as the inverse cube of the distance from the magnet, too; get twice as far away and the field strength drops by a factor of about eight.
		You'll find magnetic dampers on laboratory balances, for instance; a simple aluminium or copper tag on the end of the balance arm, moving between two strong magnets attached to the balance's frame, is the perfect way to stop the balance from oscillating for ages before settling on a reading.
	www.dansdata.com /magnets.htm (5501 words)

	What is a magnetic field? (Site not responding. Last check: 2007-10-24)
		A magnetic field can be created with moving charges, such as a current-carrying wire.
		By convention, we state that the magnetic field has a direction associated with it, such that the field exits the North end of a magnet, flows through the air or other materials nearby, and re-enters the South end of the magnet.
		Also, the direction of the tangent to the field line is the direction of the magnetic field at that point and is the direction a compass would point..
	my.execpc.com /~rhoadley/magfield.htm (944 words)

	Measuring Magnetic Field Strength using Quantum Magnetometers
		Protons in this field are polarized to a stronger net magnetization corresponding to the thermal equilibrium of stronger magnetic flux density.
		RF fields are ideal for this type of application because they are transparent to the Earth's DC magnetic field and the RF frequency is well out of the bandwidth of the precession signal (i.e.
		The frequency of the RF field required to populate level 2 varies with the ambient magnetic field and is called the Larmor frequency.
	www.gemsys.ca /Magnetometers/16_about_magnetometers.htm (693 words)

	magnetic field strength - a Whatis.com definition
		Magnetic field strength is defined as the mechanical force (newton) on a wire of unit length (m) with unit electric current(A).
		The older units for the magnetic flux, maxwell = 10-8 weber, and for the magnetic flux density, gauss (or oerstedt) = maxwell / cm2 = 10-4 tesla, are not to be used anymore.
		Magnetic flux density diminishes with increasing distance from a straight current-carrying wire or a straight line connecting a pair of magnetic poles around which the magnetic field is stable.
	whatis.techtarget.com /gDefinition/0,,sid9_gci763586,00.html (325 words)

	Magnetic fields (EHC 69, 1987)
		In the case of static magnetic fields, protection limits tend to be stated primarily in terms of the external field strength or magnetic flux density and the duration of exposure.
		The CGS unit of magnetic field strength is the oersted and that of the magnetic induction is the gauss.
		Magnetic fields that are time-varying also interact with living tissues at the macroscopic and microscopic levels to produce circulating currents via the mechanism of magnetic induction.
	www.inchem.org /documents/ehc/ehc/ehc69.htm (16312 words)

	Frontiers - Feature
		The corona is dominated by a magnetic field.
		That field is rooted in the dense layers of the photosphere, where it is influenced by the churning and convective upwelling of material from the layers beneath, interacting with localised magnetic fields that are in the form of magnetic tubes.
		Because magnetic fields control the structure of the corona it is likely that the technique will be able to investigate localised phenomena — in contrast to helioseismology which tends to look at the solar interior as a whole (though it is also beginning to probe local features).
	www.pparc.ac.uk /frontiers/archive/feature.asp?id=15F1&style=feature (1215 words)

	[No title]
		Magnetic field is a vector quantity and so the earth's magnetic field strength and direction can be determined by taking measurements of the vertical, longitudinal and latitudinal components and then summing these results.
		The measurements for the magnetic field of the earth are relatively suspect.
		strength or greater and theoretical magnetic field strengths are repeated in table 4, which serves to illustrate the differences in utility of the three coils.
	webhome.idirect.com /~simsikin/MagneticFields.html (1545 words)

	Maxiumum magnetic field strength (Site not responding. Last check: 2007-10-24)
		Magnetic fields arise from the flow of current or the intrinsic magnetic moment of a spinning particle (which is essentially a current).
		Suppose i have 2 magnetized bodies A and B where B is twice the size of A, then is B's magnetic field twice as large as A's or is there a different non-linear relationship between the two.
		The magnetic field of a neutron star (or fl hole, or whatever) is the same strength as that of the original star (allowing for some mass loss during collapse).
	www.physicsforums.com /showthread.php?t=95570 (1265 words)

	Field for a single bar magnet (Site not responding. Last check: 2007-10-24)
		A unit of measure of the strength of the magnetic field is the Gauss or the Tesla.
		This is a close-up of the field at the North pole.
		This is a close-up of the magnetic field strength at the North pole.
	my.execpc.com /~rhoadley/field01.htm (511 words)

	Magnetic Field Strength
		The magnetic fields generated by currents and calculated from Ampere's Law or the Biot-Savart Law are characterized by the magnetic field B measured in Tesla.
		But when the generated fields pass through magnetic materials which themselves contribute internal magnetic fields, ambiguities can arise about what part of the field comes from the external currents and what comes from the material itself.
		The unit for the magnetic field strength H can be derived from its relationship to the magnetic field B, B=μH.
	hyperphysics.phy-astr.gsu.edu /hbase/magnetic/magfield.html (305 words)

	Magnetic Field Strength
		The strength of the field depends on the current and the area of the wire loop.
		The Magnetic Flux Density is a measure of the amount of magnetic flux in a unit area perpendicular to the direction of magnetic flow, or the amount of magnetism induced in a substance placed in the magnetic field.
		The intensity of the Magnetic Flux Density, (B), is affected by the intensity of the Magnetic Field, (H), the quantities of the substance and the intervening media between the source of the magnetic field and the substance.
	www.electric-fields.bris.ac.uk /MagneticFieldStrength.htm (389 words)

	Eros Gets A Look Over
		Most magnetized objects, when studied from far enough outside their surfaces, have a magnetic field like that of an ordinary bar magnet, forming what is called a "magnetic dipole".
		The magnetic fields of the Sun and the Earth have prominent magnetic dipole moments, as well as most of the planets (all but Mars and Venus which have unmeasurably small dipole moments, and Pluto whose dipole moment is unknown).
		The magnetic field strength of a magnetic dipole has the property of decreasing as the inverse cube of the distance from the body (aside from an angular dependence).
	www.spacedaily.com /news/near-00ze.html (840 words)

	Magnetic field - Wikipedia, the free encyclopedia
		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.
		It is a response of a medium to the presence of a magnetic field.
	en.wikipedia.org /wiki/Magnetic_field_strength (2834 words)

	Magnetic Field Intensity (Site not responding. Last check: 2007-10-24)
		Magnetic field strength (H) is the amount of magnetizing force.
		Magnetic field strength is a vector quantity whose magnitude is the strength of a magnetic field at a point in the direction of the magnetic field at that point.
		He used a thin iron rectangle to plot the "field" lines of a spherically shaped piece of magnetite (Lodestone), and was the first to associate a field with a force.
	home.earthlink.net /~tdp/h.html (527 words)

	Magnetism: quantities, units and relationships
		Magnetic field strength cannot be measured in the same way because there is no 'magnetic monopole' equivalent to a test charge.
		If the B field pattern around a bar magnet is compared with the H field then the lines of B form continuous loops without beginning or end whereas the lines of H may either originate or terminate at the poles of the magnet.
		You could argue that B indicates better the strength of a magnetic field than does the 'magnetic field strength' H! This is one reason why modern authors tend not to use these names and stick instead with 'B field' and 'H field'.
	www.ee.surrey.ac.uk /Workshop/advice/coils/terms.html (3382 words)

	Planar Magnetic Field Antenna
		The problem with loop antennas is the magnetic field strenght is a strong function of distance from the antenna.
		Along the axis of the loop antenna, the field strength varies approximately as 1/(r^3), where r is the distance from the plane of the loop of the object.
		In the ideal case of an infinite current sheet, the magnetic field is constant with distance from the antenna to object.
	www.jhuapl.edu /ott/technologies/technology/Articles/P01579.asp (339 words)

	Initial Polar magnetic field experiment observations of the low-altitude polar magnetosphere:
		It is easier to measure such small differences in the total field than in the vector components because the accuracy of the residuals in the vector magnetic field depends on the accuracy of the knowledge of spacecraft pointing which is generally less well known than the position of the spacecraft.
		From top to bottom in Figures 2a, 2b and 2c are the magnetic latitude of the Polar spacecraft, the eastward magnetic field residuals in field-aligned coordinates, and the residuals in the magnetic field strength, respectively.
		The dependence of the residual of the magnetic field strength on the Dst index is confirmed statistically in Figures 3 and 4.
	www-ssc.igpp.ucla.edu /personnel/russell/papers/Initial_Polar (3181 words)

	[No title]
		The observers were uninformed of the order of presentation of the reversed magnetic strengths and of whether their alternating series commenced with a control or with an experimentally reversed field.
		The data were reduced to synodic monthly units and the mean path of the controls in the Earth's field for each month was correlated with the strength of the reversed magnetic field that immediately preceded it.
		It is postulated that the phenomenon reflects acclimation or accommodation of the magnetoreceptive mechanism toward the altered strengths.
	www.nature.com /nature/journal/v209/n5022/ris/209533b0refs.ris (1436 words)

	magnetic field mapping (Site not responding. Last check: 2007-10-24)
		The magnetic field mapping of the storage ring kicker magnets was carried out with a two-axis sensor support as shown in a photograph of the hutch page.
		The field strength is normalized to the maximum value in the center of the magnet KIN5.
		It was not possible to guarantee the same position for each magnet, but the parallelity of the alignment between the different magnets was very accurate, using the center hole of each kicker flange.
	slsbd.psi.ch /timing/Pulsed_Magnets/K1to5/mmap.html (379 words)

	Magnetar
		It is thought that a magnetar's magnetic field is created as a result of a convection-driven dynamo of hot nuclear matter in the neutron star's interior that operates in the first ten seconds or so of a neutron star's life.
		A small neodymium based rare earth magnet has a field of about 1 tesla, Earth has a geomagnetic field of 30-60 microteslas, and most media used for data storage can be erased with a millitesla field at very short range.
		The magnetic field of a magnetar would be lethal at a distance of up to 1000 km, tearing tissues due to the diamagnetism of water.
	www.dejavu.org /cgi-bin/get.cgi?ver=93&url=http%3A%2F%2Farticles.gourt.com%2F%3Farticle%3DMagnetar%26type%3Den (839 words)

	Single crystal pulling system - Patent 4592895
		The magnet moving mechanism moves the electromagnet in a vertical direction with respect to the crucible as the level of the crystal-melt interface is lowered during seed growth so that a predetermined required strength of magnetic field is always applied to the crystal-melt interface.
		The electromagnet is disposed at an outer periphery of the crucible so as to apply a predetermined required strength of magnetic field to the crystal-melt interface of the melt in a vertical direction with respect to the crucible, and the magnetic moving mechanism moves the electromagnet in a vertical direction with respect to the crucible.
		Thus, a magnetic field strength of H.sub.2 is invariably applied to the crystal-melt interface 6, and this allows the impurity concentration of the single crystal 7 during growth to be within the hatched region of B.sub.1 to B.sub.2, whereby the single crystal 7 of high quality can be produced.
	www.freepatentsonline.com /4592895.html?highlight=3998598 (4182 words)

	NMR Spectroscopy - Theory
		When the nucleus is in a magnetic field, the initial populations of the energy levels are determined by thermodynamics, as described by the Boltzmann distribution.
		The absorption of radiation by a nucleus in a magnetic field
		The magnetic field at the nucleus is not equal to the applied magnetic field; electrons around the nucleus shield it from the applied field.
	www.shu.ac.uk /schools/sci/chem/tutorials/molspec/nmr1.htm (1675 words)

	Turtles can read magnetic maps
		Magnetic compasses have been vital to navigation, as they enable people to use the earth’s magnetic field to tell direction.
		At different places on the earth, the strength of the earth’s magnetic field and its inclination (the angle at which it intersects the earth’s surface) are different.
		When the strength was the same as that of the western boundary of the gyre, the turtles swam east, again as if into the gyre and away from the danger boundary.
	www.answersingenesis.org /docs/211.asp (520 words)

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