
	Where results make sense

Topic: Field strength

	Magnetic field - Wikipedia, the free encyclopedia
		The direction of the field is the equilibrium direction of a compass needle placed in the field.
		Formally, the magnetic field is not a vector, it is a pseudovector.
		Electromagnetism - the physics of the electromagnetic field: a field, encompassing all of space, composed of the electric field and the magnetic field.
	en.wikipedia.org /wiki/Magnetic_field (1863 words)

	Electric Field Intensity
		Electric field strength is location dependent, and its magnitude decreases as the distance from a location to the source increases.
		And of course the strength of the fields are proportional to the effect upon the detector.
		Yet the field strength is defined as the effect (or force) per sensitivity of the detector; so the field strength of a stinky diaper or of an electric charge is not dependent upon the sensitivity of the detector.
	www.glenbrook.k12.il.us /gbssci/phys/Class/estatics/u8l4b.html (2098 words)

	Surface Voltage and Field Strength: Part I, Insulators
		In the region where the field is homogeneous, the surface voltage of the sheet is proportional to the distance from the sheet and is measured, using Equation 6, by a noncontacting voltmeter.
		It appears that, under these conditions, it is possible to estimate the charge density by measuring either the field strength or the surface voltage from the charged disk, assuming the permittivity and thickness of the disk are known.
		When the field meter is placed in front of a charged plate, the electric flux from the charge is shared between the field meter and the backing plate.
	www.ce-mag.com /archive/01/09/mrstatic.html (2368 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.
		But the rapid diminution of the field strength means that you can hold the strongest of these magnets - the three spheres end-to-end, for instance - in your hand and wave them around a mere foot and a half from a computer monitor, and notice only slight image distortion and discolouration.
		The magnetic field strength on the surface of a pulsar has to be at least several million Tesla, and may range as high as a thousand million Tesla.
	www.dansdata.com /magnets.htm (5513 words)

	Electric Field Lines
		The magnitude or strength of an electric field in the space surrounding a source charge is related directly to the quantity of charge on the source charge and inversely to the distance from the source charge.
		The field lines are closer together in the regions of space closest to the charge; and they are spread further apart in the regions of space furthest from the charge.
		The strength of the field is represented by the length of the arrow and the direction of the field is represented by the direction of the arrow.
	www.glenbrook.k12.il.us /gbssci/phys/Class/estatics/u8l4c.html (1999 words)

	Magnetic Field Strength (Site not responding. Last check: 2007-10-07)
		The strength of the field depends on the current and the area of the wire loop.
		In the UK and the USA, the strength of the magnetic field is normally expressed as Magnetic Field Strength (SI unit: amperes per metre, A/m), or Magnetic Flux Density (B).
		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)

	Field strength - Wikipedia, the free encyclopedia
		ʐIn physics, the field strength of a field is the magnitude of its vector (spatial) value.
		In theoretical physics, the field strength is just another name for the curvature form.
		For the electromagnetic field, the curvature form is just an antisymmetric matrix whose elements are the electric field and magnetic field: the electromagnetic tensor.
	en.wikipedia.org /wiki/Field_strength (101 words)

	[No title]
		The magnetic field strength is a critical parameter in a magnetron design, but it is one that is often chosen in practice by empirical methods and guesswork.
		The magnetic field B is formed by a cylindrical magnet and a concentric ring of 30 bar magnets, sandwiched between a non-ferrous cathode and a steel pole piece.
		The electric field is one-dimensional, and it depends on the potential drop between the cathode and the plasma.
	dusty.physics.uiowa.edu /~goree/papers/Bscan.html (2181 words)

	Specific Arguments - Magnetic Field
		In contrast, Barnes' hypothesis of a freely decaying field cannot explain the existence, configuration, movement, or changes in the nondipole field, the fluctuations in the dipole moment, the reversals in field polarity, or the documentation in the geologic record of the continued existence of the field for more than three billion years.
		The dipole field is not an accurate measurement of the overall strength of the earth's magnetic field.
		Studies of the magnetic field as recorded in dated rocks and pottery have shown that the dipole moment actually fluctuates over periods of a few thousand years and that decreases in field intensity are eventually followed by increases.
	www.infidels.org /library/modern/dave_matson/young-earth/specific_arguments/magnetic_field.html (1735 words)

	Definition: field strength (Site not responding. Last check: 2007-10-07)
		field strength: The magnitude of an electric, magnetic, or electromagnetic field at a given point.
		(188) Note: The field strength of an electromagnetic wave is usually expressed as the rms value of the electric field, in volts per meter.
		The field strength of a magnetic field is usually expressed in ampere-turns per meter or in oersteds.
	www.its.bldrdoc.gov /fs-1037/dir-015/_2219.htm (71 words)

	Field Strength Measurements
		The primary reason for measuring the signal strength on the FAA beacon is to examine the propagation characteristics through the Rocky Mountains west of Denver.
		The DGPS signal strength is measured by performing 50 separate sweeps of a 500 Hz span spaced between one to five seconds apart.
		Based on the antenna correction factor and the known frequency, the signal field strength is calculated as described in Appendices A and B.
	www.tfhrc.gov /its/fsm/fsmeas.htm (1851 words)

	Field strength sensors calibration
		The calibration of electromagnetic field probes needs to generate a reference field which intensity and spatial configuration are known with good accuracy inside a certain volume where the meter under test will be placed.
		The field strength can be calculated from the dimensions of the cell, its impedance at the measurement plane and the input power.
		The reference field strength is calculated knowing the net power transferred to the antenna, its gain and the distance from the sensor under calibration.
	www.pmm.it /main/sensor.asp (431 words)

	Electromagnetic Radiation: Field Memo
		Since both the E field and the H field components of electromagnetic waves are absorbed by living tissue, and since the relationship between E and H is complicated in the near-field, we must measure both E and H when evaluating near-field hazards.
		Ratio of the electric field (E) to the magnetic field (H), in the far-field this is the characteristic impedance of free space, 377 Ohms.
		The inverse-square law is defined as: "A statement that the strength of a field due to a point source or the irradiance from a point source decreases as the square of the distance from the source.
	www.osha.gov /SLTC/radiofrequencyradiation/electromagnetic_fieldmemo/electromagnetic.html (8300 words)

	RF Field Strength Meter
		Unlike other low-cost field strength meters, this meter's frequency response does not depend on the characteristics of an external antenna; the internal detection system yields a flat response over a very wide range of frequencies.
		The RF Field Strength Meter is directional and it detects only the component of the electric field which has the same polarization as the long axis of the meter.
		The presence of your hand and arm will have some effect on the field strength at the meter, so the most accurate reading is taken by setting the meter on a non-metallic surface or using, for example, a plastic holder.
	www.trifieldmeter.com /RF.html (1321 words)

	electric field strength - a Whatis.com definition (Site not responding. Last check: 2007-10-07)
		Electric field strength is a quantitative expression of the intensity of an electric field at a particular location.
		The field strength at a particular distance from an object is directly proportional to the electric charge, in coulombs, on that object.
		Sometimes the strength of an electromagnetic field (EM field) is specified in terms of the intensity of its electric-field component.
	whatis.techtarget.com /definition/0,,sid9_gci752086,00.html (399 words)

	What is a magnetic field?
		A magnetic field can also be created by the spin magnetic dipole moment, and by the orbital magnetic dipole moment of an electron within an atom.
		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.
	my.execpc.com /~rhoadley/magfield.htm (718 words)

	WHO \| What are electromagnetic fields?
		The earth's magnetic field causes a compass needle to orient in a North-South direction and is used by birds and fish for navigation.
		Man-made sources of electromagnetic fields that form a major part of industrialized life - electricity, microwaves and radiofrequency fields – are found at the relatively long wavelength and low frequency end of the electromagnetic spectrum and their quanta are unable to break chemical bonds.
		Electric fields are strongest close to a charge or charged conductor, and their strength rapidly diminishes with distance from it.
	www.who.int /peh-emf/about/WhatisEMF/en (1685 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)

	Is the Earth
		In a reversed magnetic field (by definition, today's field is 'normal') a compass will point to the south geomagnetic pole and the inclination (dip of the magnetic needle) will also invert itself at all locations on the globe with the exception of the magnetic equator (Figure 1).
		Simply put, the magnetic dipole field strength does not drop to zero and then instantaneously recover in the opposite sense nor does the direction switch from north to south seeking (although this is mathematically feasible in the case of zero intensity).
		Certainly, none of the field equations argue that there must be a balance between the decay of the dipole and a corresponding increase in off-dipole terms (in fact the toroidal and poloidal fields decay on separate time scales).
	gondwanaresearch.com /hp/magfield.htm (4787 words)

	Electric Field - A Field of Force (Site not responding. Last check: 2007-10-07)
		As long as we are using the same test charge it is possible to vaguely describe the strength of the field as stronger or weaker.
		Field Intensity or Field Strength is described as the ratio of Force to the amount of test charge.
		You must simply look at the region you are calculating the field strength for and then determine the direction that a positive test charge would be forced.
	www.regentsprep.org /Regents/physics/phys03/afieldint (312 words)

	Field Strength Meter MkI
		Up to now, field strength meters have only been able to detect transmitters with an output of 100 milliwatts or higher, and for an output such as this, a simple circuit such as a meter and a coil is sufficient.
		The meter is wired as a "DIP" meter and the needle deflects towards zero as the field strength increases.
		Hold the Field Strength Meter in your hand (keep away from the actual circuit by holding the multimeter) and bring the receiving antenna near the Voyager antenna, without touching it.
	www.talkingelectronics.com /Projects/FieldStrengthMeterMkl/FieldStrengthl.html (2305 words)

	Field Strength (Site not responding. Last check: 2007-10-07)
		A player's "field strength" is a rating like number that reflects the level at which he/she was paired, that is, how tough the tournament was for that player.
		To illustrate the conceptual difference between rating, opposition and field strength, suppose that two players are paired twice in even games, alternating color assignments, and that each wins one game.
		The calculation of field strength picks up all these nuances, and in practice, two players never have exactly the same field strengths, although they may be very close.
	ourworld.compuserve.com /homepages/AccelRat/Field.htm (241 words)

	EMF Detector (Site not responding. Last check: 2007-10-07)
		It independently measures electric field and magnetic field, and is properly scaled to indicate the full magnitude of currents produced by each type of field inside a conductive body.
		The power density increases as the square of the field strength, and the field strength decreases as the inverse distance from the transmitting antenna.
		This is because the electric field component of radio waves produces much weaker currents in the body than does the magnetic field unless the wavelength of the waves is smaller than the height of the body.
	www.trifield.com /EMF_meter.htm (1817 words)

	Field Strength Meter (Site not responding. Last check: 2007-10-07)
		This is a wide band signal strength meter circuit which responds to small changes in RF energy, designed to be used for the VHF spectrum and will respond to AM or FM modulation or just a plain carrier wave.
		This circuit measures radio field strength by converting the signal to DC and amplifying it.
		This field strength meter was designed for VHF frequencies in the range 80 -110 MHz.The inductor L1 is 4 to 6 turns of 20swg wire air spaced wound on a quarter inch former or similar.
	www.zen22142.zen.co.uk /Circuits/rf/fsm.htm (247 words)

	Electrostatic Analysis Types: Field Strength and Voltage
		Electrostatic field strength and voltage analysis is used to study electric fields around objects.
		Analysts can use electrostatic field strength and voltage analysis to ensure that an electric field does not exceed the dielectric strength of a capacitor or a surrounding medium.
		Unlike electrostatic current and voltage analysis, electrostatic field strength and voltage analysis requires engineers to model the area around a conducting object.
	www.algor.com /products/analysis_types/electrostatic/field_volt.asp (109 words)

	Definition: field strength (Site not responding. Last check: 2007-10-07)
		The magnitude of an electric, magnetic, or electromagnetic field at a given point.
		Note: The field strength of an electromagnetic wave is usually expressed as the rms value of the electric field, in volts per meter.
		The field strength of a magnetic field is usually expressed in amperes per meter Synonym radio field intensity.
	www.atis.org /tg2k/_field_strength.html (99 words)

	WiNRADiO Field Strength Logger
		It is useful wherever it is necessary to measure absolute signal or field strength levels, and store them in a file in user-definable time intervals.
		For use in geographical signal coverage surveys, the Field Strength Logger employs a GPS receiver to display and store geographical co-ordinates of the measured signal.
		The Field Strength Logger relies on the receiver and antenna calibration values stored in user-editable tables.
	www.winradio.com /home/fslogger.htm (302 words)

	FIM 71 Field Strength Meter, field intensity measurement, RF measurements, Potomac Instruments
		Combining a calibrated half-wave dipole antenna and a highly accurate tuned voltmeter with a range of 140 dB, the FIM-71 is suitable for practically all types of RF emission measurements in the 45 MHz to 225 MHz spectrum.
		The 4-1/2 inch, taut band, mirrored scale meter is calibrated in volts and dB for precise measurements in field or laboratory environments.
		Field Strength: ±3.0 dB (LIN), ±3.5 dB (LOG) for field strengths >1.8µV/M (AM/FM) or >3.7µV/M (TV) at 45 MHz; >9.1 V/M (AM/FM) or >18.1µV/M (TV) at 225 MHz; using the supplied antenna.
	pi-usa.com /fim71/fim71g.htm (698 words)

	Magnetic Field Strength (Site not responding. Last check: 2007-10-07)
		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.
		It has been common practice to define another magnetic field quantity, usually called the "magnetic field strength" designated by H. It can be defined by the relationship
	hyperphysics.phy-astr.gsu.edu /hbase/magnetic/magfield.html (251 words)

Try your search on: Qwika (all wikis)