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Topic: Electric field strength

	Electric field - Wikipedia, the free encyclopedia
		Electric fields exist around all charges; the direction of field lines at a point is defined by the direction of the electric force exerted on a positive test charge placed at that point.
		The strength of the field is defined by the ratio of the electric force on a charge at a point to the magnitude of the charge placed at that point.
		The electric field or electric field intensity is a vector quantity, and the electric field strength is the magnitude of this vector.
	en.wikipedia.org /wiki/Electric_field (1073 words)

	PlanetPhysics: Electric Field (Site not responding. Last check: 2007-11-02)
		In physics, an electric field or E-field is an effect produced by an Electric Charge that exerts a force on charged objects in its vicinity.
		Electric fields are composed of photons and contain electrical energy with energy density proportional to the square of the field intensity.
		The electric field is equal to the negative gradient of the electric potential.
	planetphysics.org /encyclopedia/ElectricField.html (562 words)

	Dielectric strength - Wikipedia, the free encyclopedia
		The theoretical dielectric strength of a material is an intrinsic property of the bulk material and is not dependent on the configuration of the material or the electrodes with which the field is applied.
		If the applied electric field is sufficiently high, free electrons may become accelerated to velocities that can liberate additional electrons during collisions with neutral atoms or molecules in a process called avalanche breakdown.
		The field strength at which breakdown occurs in a given case is dependent on the respective geometries of the dielectric (insulator) and the electrodes with which the electric field is applied, as well as the rate of increase at which the electric field is applied.
	en.wikipedia.org /wiki/Dielectric_strength (314 words)

	Electric Fields (Site not responding. Last check: 2007-11-02)
		Intuitively, the electric field strength measures the amount of force, in newtons, experienced by a coulomb of charge when it is placed at a particular position within an electric field.
		Electric field lines point in the direction in which a positive test charge would respond to the electrostatic force; that is, away from positive charges and towards negative charges.
		Fields between oppositely charged particles are attractive and are elliptical in shape; while fields between similarly charged particles are repulsive and hyperbolic in shape.
	online.cctt.org /physicslab/content/phyapb/lessonnotes/electrostatics/lessonelectricfields.asp (452 words)

	Electric Field Intensity (Site not responding. Last check: 2007-11-02)
		) is in the equation for electric field.
		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.
	www.glenbrook.k12.il.us /gbssci/phys/Class/estatics/u8l4b.html (2098 words)

	Fundamentals of Electricity (Site not responding. Last check: 2007-11-02)
		The strength of the electric field is measured in volts per meter and varies with the amount of the source voltage.
		The strength of a magnetic field is typically measured in units of gauss or milligauss and varies with the amount of current moving through a conductor.
		The magnetic field produced by a microwave at 1 foot is 70 to 100 milligauss while at five feet away, the magnetic field strength drops to five milligauss.
	cipco.apogee.net /foe/fbmef.asp (300 words)

	electric field strength - a definition from Whatis.com
		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)

	Electric Field Lines (Site not responding. Last check: 2007-11-02)
		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 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.
		Whatever the method used to determine the electric field line patterns for a configuration of charges, the general idea is that the pattern is the resultant of the patterns for the individual charges within the configuration.
	www.glenbrook.k12.il.us /gbssci/phys/Class/estatics/u8l4c.html (1999 words)

	Integrated Engineering (Site not responding. Last check: 2007-11-02)
		The study of the electric field and voltage distributions of polymer insulators under wet conditions is important for the in-depth understanding of the aging process and the pollution flashover initiation mechanism for polymer insulators.
		The objective of this paper is to study the electric field enhancement factors on the surface of water droplets, and to calculate the overall electric field and voltage distribution along a polymer insulator under different hydrophobicity conditions.
		The magnitude of the electric field strength in the air along the surface of the sheath for Cases (a)-(d) are shown in Fig.
	www.integratedsoft.com /papers/research/sebo4 (1735 words)

	Electric Forces and Fields
		The strength of the force acting on the test charge at each point in space is the magnitude of the test charge times the electric field strength.
		Figure 1(a) illustrates the electric field in the region of a pair of unlike charges and Figure 1(b) illustrates the electric field in the region of a pair of like charges.
		Electric field strength is directly proportional to the force exerted on a positive test charge.
	www.as.wvu.edu /coll03/phys/www/rotter/phys201/6_Electricity/Electric_Forces_and_Fields.htm (1239 words)

	Electromagnetic Radiation: Field Memo
		Electric voltage potential and electric current are measured in volts and amperes respectively; E fields and H fields are measured in volts per meter and amperes per meter, respectively.
		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.
		In electric circuits we measure E and I in units of volts and amperes, respectively; E fields and H fields are measured in volts per meter and amperes per meter, respectively.
	www.osha.gov /SLTC/radiofrequencyradiation/electromagnetic_fieldmemo/electromagnetic.html (8300 words)

	Electric Field: Electrostatics: Plus 2 Physics (Site not responding. Last check: 2007-11-02)
		The electric field strength is also given by the number of lines of force per unit area held at right angles with the lines of force.
		The electric field strength at points outside a charged sphere is to be calculated by considering the entire charge to be located at the centre of the sphere.
		The electric field strength at any point outside the sphere is inversely proportional to the square of the distance of that point from the centre of the sphere.
	www.plus2physics.com /electrostatics/study_material.asp?chapter=2 (376 words)

	SCALP CURRENT DENSITY
		Given that EEG is often measured at the scalp surface, it is useful to derive the sum of electric field strength for a surface.
		The electric potential is defined as the work done in moving a charged particle from point A to another point B in an electric field.
		The gradient of a scalar field is said to be conservative because the work done in displacing an object from point A to B in the field depends only on A and B and not on the path of the displacement.
	dnl.ucsf.edu /users/dweber/dweber_docs/eeg_scd.html (5414 words)

	Saville
		The purpose of this research was to simulate chain-post interactions and investigate the effect of electric field strength, especially in low fields where motion due to random noise becomes comparable to that due to the electric field.
		The primary effect of field strength is to define the mobility of the unimpeded polyelectrolyte chains.
		An electric field of strength E is applied in the z-direction (with the y-direction perpendicular to the field).
	anusf.anu.edu.au /annual_reports/annual_report97/I-Saville.html (559 words)

	Electric Field Scaled-Variable Spectroscopy (Site not responding. Last check: 2007-11-02)
		This is the field strength range used by Courtney for the experiment and Dando for his figure 3.
		This is a graph of the magnitude of semiclassical FT in the field strength range of the Wesleyan experiment if there is a random energy error or a bandwidth of the laser of a few parts in 10^-6 atomic units.
		This is a stacked plot for m=0 where the magnitude of th FT is plotted for the electric field range scanned in the experiment.
	www.lsmsa.edu /jshaw/efield.html (438 words)

	[No title]
		electric field (strength): a vector force field that is used to represent the forces between electric charges.
		Electric-field strength is a unit defined as the force per unit charge on an infinitesimally small charge at any given point in space, and it is usually represented by the simple E.
		Magnetic-field strength is the component of the magnetic field that is measured.
	www.deas.harvard.edu /courses/es96/spring1997/web_page/health/glossary.htm (979 words)

	The Poynting vector, power transmission, and the CFA. (Site not responding. Last check: 2007-11-02)
		The units of electric field strength E are volts/metre, and the units of magnetic field strength H are amps/metre.
		There is a magnetic field generated around each of the wires by the current flowing in them, and there is an electric field between the wires because of the voltage drop across the resistor.
		The displacement current is arranged to be in phase with the electric field, which means that the electric field generating the displacement current is in phase quadrature with the electric field from the conical electrode.
	www.antennex.com /shack/Nov99/pv_cfa.htm (1742 words)

	Chapter 13 question 2
		The electric field strength E at a point is defined as the force per unit test charge placed at that point.
		Since the electric force is in the same direction as the initial velocity, the particle accelerates (moves with increasing velocity) in a straight line.
		Since the electric force is in the opposite direction as the initial velocity, the particle decelerates until it is instantaneously at rest and then accelerates in the opposite direction.
	www.geocities.com /physics_material/beyond2000/13/13-2.htm (436 words)

	Field strength sensors calibration (Site not responding. Last check: 2007-11-02)
		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)

	Precise Power Flux Density Measurements at Base Stations
		The precaution limits are 6 V/m for the electrical field strength and 0.016 A/m for the magnetic field strength.
		For this example, the field strength of a dual-band GSM base station (at 900 MHz and at 1.8 GHz) in an urban area must be measured at several locations.
		Due to the isotropic characteristic of the field probe, the unknown direction of maximum field and the unknown polarization are not important.
	www.ce-mag.com /archive/02/Spring/mullner.html (1782 words)

	Definition: field strength (Site not responding. Last check: 2007-11-02)
		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.
		The electric field strength in the horizontal plane.
	www.atis.org /tg2k/_field_strength.html (99 words)

	Basic Electric Field Relationships (Site not responding. Last check: 2007-11-02)
		How do the field strengths compare at points A and B? [B is twice the distance from the central charge as is A] How do the field strengths compare at points B and C? [C is three times the distance from the central charge as is A] If the central charge is +3
		The electric field intensity is zero at the midpoint of which group of charges?
		What does it mean to say that an electric field is "radial?" If the field lines in an electric field are parallel to each other, what does this tell you about the electric field strength in that region?
	online.cctt.org /physicslab/content/PhyAPB/lessonnotes/electrostatics/electricfieldDrill.asp (364 words)

	Electric Fields: Chapter 21 Study Guide
		The “strength” of the gravitational field is given by stating that force that will be exerted on a known mass (normally one kilogram) at that particular place.
		IF a Coulomb of electrons experiences a repulsive force of 40 N at a distance of 1.5 meters away from a Van de Graaf (VdG) electrostatic generator, then the electric field strength is 40 N/C. CALCULATE the field strength at 3m away from the VdG.
		The strength of an electric field is given as Force per unit Charge (or N/C).
	members.cox.net /smccausl1/PHYSICS/PhysStdyGds/PhysStdyGdChpt21.htm (760 words)

	Aerosols and pressure. Electrostatic effects - sparks. (Site not responding. Last check: 2007-11-02)
		In an external electric field, the nucleus and electrons will feel forces in opposite directions.
		The electric force on charged particles is called the electric field strength, E.
		We can show that the electric field strength is also equal to the potential gradient, or voltage per metre.
	www.schoolscience.co.uk /content/5/physics/bama/aerosch5pg1.html (725 words)

	[No title]
		TLO 12 Define the capacitor as a storage element for energy in the electric field, and develop the current and voltage behaviour in an R-C circuit.
		ELO 12.1 Describe the electric field and the terminology used to define electric field strength.
		Electric flux lines always extend from the positively charged to the negatively charged body, always terminate perpendicular to the charged surfaces, and never intersect.
	www.ee.unb.ca /Courses/EE1713/ch10.htm (1325 words)

	Electric Field Strength (Site not responding. Last check: 2007-11-02)
		Electric field strength is the intensity of an electric field.
		Radio waves are composed of an electric component which has a given electric field strength and a magnetic component which has a given magnetic field strength.
		The power per unit area in a wave front is called Poynting's Vector and is the product of the electric and magnetic fields.
	home.earthlink.net /~tdp/electricfield.html (203 words)

	WP II Unit 2 Homework - Week 2
		At the point B show how the resultant field vector is obtained by adding the contribution to the field from the two charges, using vector addition.
		Some one claims that lines A-F are possible field lines describing the electric field lying in the region between the two conductors.
		Assuming that this field arises from charge distributed in a spherically symmetric manner over the surface of the earth, determine the net charge of the earth and its atmosphere if the radius of the earth and its atmosphere is 6.37x10^6m.
	www.marshall.edu /workshop-physics/U2S04.HTM (668 words)

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