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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. In the dynamic case the electric field is accompanied by a magnetic field (if charges producing electric field move with constant velocity), or by electromagnetic field (when charges move with acceleration). 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/Electrostatic_field   (1027 words)

Electrostatic loudspeaker - Wikipedia, the free encyclopedia Electrostatic loudspeakers use a thin flat diaphragm usually consisting of a plastic sheet impregnated with a conductive material such as graphite sandwiched between two electrically conductive grids, with a small air gap between the diaphragm and grids. As a result a uniform electrostatic field proportional to the audio signal is produced between both grids. In all but a few modern electrostatic loudspeakers the diaphragm is driven by two grids, one on either side, because the force exerted on the diaphragm by a single grid is non-linear, thus causing harmonic distortion. en.wikipedia.org /wiki/Electrostatic_speaker   (925 words)

What is electrostatic field? - a definition from Whatis.com Electrostatic fields are blocked by metallic objects, while magnetic fields can pass through most (but not all) metals. Electrostatic fields arise from a potential difference or voltage gradient, and can exist when charge carriers, such as electrons, are stationary (hence the "static" in "electrostatic"). Magnetic fields arise from the movement of charge carriers, that is, from the flow of current. searchsmb.techtarget.com /sDefinition/0,,sid44_gci212048,00.html   (354 words)

Research   (Site not responding. Last check: 2007-11-01) This electrostatic field, and the force it creates, can be illustrated with lines called "lines of force" as shown in Figure 4. When two objects of opposite charge are brought near one another, the electrostatic field is concentrated in the area between them, as shown in Figure 5. This leads us to the law of electrostatic attraction, commonly referred to as Coulomb's Law of electrostatic charges, which states that the force of electrostatic attraction, or repulsion, is directly proportional to the product of the two charges and inversely proportional to the square of the distance between them as shown in Equation 1-1. www.4ebr.com /research/ionic_field.cfm   (543 words)

Electrostatic Analysis Types: Field Strength and Voltage   (Site not responding. Last check: 2007-11-01) 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)

3-D Electrostatic Field Applet Directions You can select from a number of fields and see how particles move in the field if it is treated as either a velocity field (where the particles move along the field lines) or an actual force field (where the particles move as if they were charged particles). dielectric is an insulating material whose atoms are polarized in response to an external field; this causes the field to be weaker inside the dielectric. dielec sphere in field D: This is the electric displacement vector of a dielectric sphere in a uniform external field. www.falstad.com /vector3de/directions.html   (1343 words)

Electrostatic Discharge Association: Fundamentals of ESD Electrostatic discharge is defined as the transfer of charge between bodies at different electrical potentials. If the device is removed from the region of the electrostatic field and grounded again, a second CDM event will occur as charge (of opposite polarity from the first event) is transferred from the device. Electrostatic discharge can damage devices so they fail immediately, or ESD may result in latent damage that may escape immediate attention, but cause the device to fail prematurely once in service. www.esda.org /basics/part1.cfm   (2747 words)

Magnetic and electrostatic confinement of plasma with tuning of electrostatic field - Patent 7015646 As the ion is accelerated by the electric field 46, the magnetic field 44 bends the ion's orbit. Thus, the electrostatic field of the system would avoid ion transport by eliminating this ion loss mechanism, which is similar to a loss cone in a mirror device. This magnetic field may be produced by, e.g., a permanent magnet or by an electromagnet along the path of the ion beam. www.freepatentsonline.com /7015646.html   (16405 words)

Electrostatic, Magnmetic and Gravitational Fields The field energy will disperse through out any other particulate, air molecules, containment walls, whatever is past containment walls, anything the static electric radiation is capable to reach before it becomes locally and generally tied and balanced. The outer field of gravitation is usually a mixture of alternating polarity paths of communication and direct polarity paths of communication among the array of quarks, which make up matter. Most of this field is retained close to the surface of a gravitating body in a character of the tangential magnetic field array geometry in Fields 2. www3.sympatico.ca /slavek.krepelka/ttf2/fields3.htm   (1826 words)

WEIRD SCIENCE: Scalar Electrostatic Gradiometer The Scalar Electrostatic Gradiometer is a device which measures the interaction of environmental electrostatic fields and gradients with an artificially generated electrostatic field. The user may control the polarity and magnitude of the artificially generated electrostatic field, which is used to sense environmental fields and phenomena by direct electrostatic field to field interference. By mapping non-linearities in the ambient environmental electrostatic fields, an area may be scanned for "congruences" of bioelectric and exotic fields, and anticipate probable sites for future activity as well as locations of present or past events. www.amasci.com /freenrg/grado.html   (3365 words)

DUAL FREQUENCY Electrostatic Treater - NATCO The patented Dual Frequency® electrostatic technology utilizes a proprietary process controller and threephase transformer package to produce a customized electrostatic field that can be readily optimized for any crude oil. As with Dual Polarity, a DC field is created between the electrodes in the Dual Frequency® coalescer, enabling one directional droplet motion and efficient coalescence. Simultaneously, an AC field is created between the electrodes and the ground, enabling maximum droplet excitation, contact and droplet growth. www.natcogroup.com /Content.asp?t=ProductPage&ProductID=93   (433 words)

Electrostatic Potential In terms of volts, we have a simpler expression for the units of electric field. Since the electrostatic force is conservative, the energy of a particle at some point is independent of the path it took to get there. The direction of the electric field at some point on a contour points in the direction of the shortest distance to close-by contour points, as shown in Figure 7.7. www.cartage.org.lb /en/themes/Sciences/Physics/Electromagnetism/Electrostatics/ElectrostaticPotential/Electrostatic/Electrostatic.htm   (747 words)

Unified Field Theory The diverging electrostatic field created by the earth causes dipoles in neutrally charged matter to be attracted to the source of the field. It is a scientific fact that an electrostatic field exists on the earth. Science currently thinks that the effects of atmospheric magnatisim are small and that the main field comes from the molten core, however, there is no explanation on how the magnetic field got into the core in the first place and what keeps it going. ourworld.compuserve.com /homepages/frankhu/gravity.htm   (3066 words)

Microsystem Analysis Key Feature- Electrostatic-Structural Coupling Electrostatic field analysis is important in MEMS to determine both capacitance and electrostatic forces which are typically used to actuate devices such as comb drives. Coupling the electrostatics with the structural solution allows the actual electrostatic actuation of a MEMS device to be simulated, capturing the interdependencies of these these two physics. The soft air approach is the techinque used to model a field around a structure simply by setting the elastic modulus of the field material to a suitably low value. www.ansys.com /industries/mems/mems-feature-es-coupling.asp   (1673 words)

How to Apply Electromechanical Forces For example, a MEMS radial comb motor generates an electrostatic field in the air that pushes on its metal parts to precisely move them. When setting up the model for an electrostatic field strength and voltage analysis in the FEA Editor environment of FEMPRO, use the "Analysis Parameters" dialog to specify that electromechanical forces should be calculated by activating the "Invoke force generator" option on the "Options" tab. Thus, the multiphysics capability to calculate electromechanical forces in an electrostatic field strength and voltage analysis and then apply them as a load in a structural analysis enables you to accurately simulate electromechanical effects. www.algor.com /service_support/hints_tips/electromechanical_forces.asp   (564 words)

ELECTROSTATIC PRECIPITATORS   (Site not responding. Last check: 2007-11-01) Generation of a corona requires the development of a highly non-uniform electric field-a condition, which occurs near the wire when a high voltage is applied between wire and cylinder electrodes. The electric field near the wire accelerates electrons present in the gas to velocities sufficient to cause ionization of the gas near the wire. When the electric field throughout the gap between the wire and the plate becomes strong enough, a spark will occur, and the voltage cannot be increased further without severe sparking. air.tamuk.edu /courses/5328/sec10/sectionten.html   (2115 words)

Electrostatic fields paper Field lines are normal to equipotential surfaces in any point; also, since field lines are solutions of a differential equation, they don't cross. This simulates the field inside a plane capacitor; as expected, the field is almost uniform. Electrostatic field computations are implemented in separate C++ classes, so the code is reusable for other applications. alumnus.caltech.edu /~muresan/projects/esfields/field.html   (2998 words)

Envitech: Wet Electrostatic Precipitator Air Pollution Control System The Wet Electrostatic Precipitator uses high-intensity ionization disks mounted on a central discharge electrode. The field strength can be maintained at high levels with minimal sparking, resulting in the highest available efficiency. The greater the electrostatic field strength, the greater the particle migration velocity (velocity component towards the collection tube). www.envitechinc.com /wep.zhtml   (218 words)

Particles and fields   (Site not responding. Last check: 2007-11-01) So quantum mechanics has the concept of a point charge with the probability of it being in any particular position being related to its capability to interact at that position. Field theory has the concept of a distributed charge that has a certain energy density at a certain position leading to that certain capability to interact at that position. For an example of a concept that is inaccessible to quantum mechanics but is self-evident in field theory, take the example of a bounded polar electric field, and see if it might link electrostatic forces with nuclear forces. uk.geocities.com /steersman@btinternet.com   (192 words)

PinkMonkey.com Physics Study Guide - Section 19.2 Electrostatic Field We define an Electrostatic field as the region of space in which a test charge (sufficiently small, so that it does not disturb the field) experiences electrostatic force, the mathematical expression of the force being the Coulomb's law expression. is defined at any point in the given electrostatic field as the electrostatic force per unit positive test charge q placed at the given point in the field. The electrostatic field is a conservative field, i.e, its line integral along a closed curve is always zero. www.pinkmonkey.com /studyguides/subjects/physics/chap19/p1919201.asp   (458 words)

NSDL Metadata Record -- 3-D Electrostatic Field Simulation The field can be displayed as a velocity or force field with particles following field lines, or as field or equipotential lines. The potential and fields can be displayed in 3-D or on a movable 2-D slice. The field strength and number of particles is adjustable, and the charge can be reversed. nsdl.org /mr/464458   (107 words)

SPACE.com -- Lunar Shields: Radiation Protection for Moon-Based Astronauts Researchers are also studying a multiple-screen approach to determine the potential of a tiered system, in which negative and positive electrostatic fields are alternated to keep lunar dust from clogging the shield works while deflecting charged radation particles. But the challenge lies in arranging a number of spheres to build a comprehensive electric field that is strong enough to deflect radiation, but not so strong that it rips electrons out of the moonbase structure or surrounding material - hence the 40-meter poles to keep generators at a safe, water tank-high distance. Spherical generators could be combined flat electrostatic screens placed low to the ground to keep moon dust from being attracted to generator surfaces and clogging the works, Lane said, adding that the same lunar material could be tapped as a secondary shield. www.space.com /businesstechnology/lunarshield_techwed_050112.html   (939 words)

Electrostatic Applications: Parker   (Site not responding. Last check: 2007-11-01) Increased awareness of the effects of atmospheric pollution and ever-tightening legislation have challenged the precipitation industry to increase performance at economical costs and operation of the precipitators has to be maintained at optimum levels to prevent penalizing consequences to plant operators. The technique of electrostatic precipitation has undergone considerable development over the past decades and is now the method of choice for limiting particulate discharges. This volume is a good authoritative and practical guide for the industry specialist with contributions by leading experts in the field of electrostatic precipitation. www.electrostatic.com /parker.htm   (317 words)

Evaluation of the Electrostatic Field Strength at the Site of Exocytosis in Adrenal Chromaffin Cells -- Rosenheck 75 ... field strength, this field is sufficiently strong to cause membrane FIGURE 2 Electrostatic field strength within the granule lipid bilayer as a function of the distance, d, from the cytoplasm- membrane interface, calculated for intermembrane separations, z, of 2.5, 3.0, and 4.0 Debye lengths. FIGURE 3 Field strength as a function of intermembrane separation for disc radii, R, of 10, 5, and 2.5 nm. www.biophysj.org /cgi/content/full/75/3/1237   (3585 words)

NSDL Metadata Record -- 2-D Electrostatic Field Simulation This applet simulates the electric field of many charge distributions, including point charges, line charges, dipoles, cylinders, conducting planes and more. The field strength and number of particles are adjustable. The field can be displayed as a velocity field or a force field. nsdl.org /mr/464457   (61 words)

Coaxial Electrostatic Field Collapse Demonstration Apparatus The demonstration is performed by using a cloth to charge one end of the PVC pipe frictionally and then tipping it so that the insert slides down to the charged end. This apparatus, which can be operated with one hand, is used in conjunction with the TESV to demonstrate the basic principle of electrostatic field collapse. For this reason, non-contacting electrostatic voltmeters intended to measure the surface charge on a photoreceptor in a xerographic copy machine should not be positioned near rollers or any other conductor backing the web. www.ece.rochester.edu /~jones/demos/coaxcollapse.html   (636 words)

electrostatic propulsion A form of electric propulsion in which the thrust is produced by accelerating charged particles in an electrostatic field. It includes three types of device: electron bombardment thrusters, contact ion thrusters, and field emission/colloid thrusters. Of these, the first two involve the production and acceleration of separate ions and are therefore forms of ion propulsion. www.daviddarling.info /encyclopedia/E/electrostaticprop.html   (147 words)

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