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Topic: Electric field


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  Problem Set - Electric Fields - Physics 106
The number of electric field lines per unit area crossing a surface at a right angle to the surface equals the electric field at the surface.
Find the electric field for (a) r ≤ R, (b) r ≥ R. (c) Sketch a graph of E as a function of r.
A proton of charge +e and mass m is placed in an electric field E. Find (a) the acceleration of the proton and (b) the velocity and displacement of the proton in time t after entering the field.
www.wellesley.edu /Physics/phyllisflemingphysics/106_p_electric.html   (0 words)

  
  Electric field
Electric field is defined as the electric force per unit charge.
The electric field is radially outward from a positive charge and radially in toward a negative point charge.
A positive number is taken to be an outward field; the field of a negative charge is toward it.
hyperphysics.phy-astr.gsu.edu /hbase/electric/elefie.html   (223 words)

  
  Electric field
The electric field E is analogous to g, which we called the acceleration due to gravity but which is really the gravitational field.
the electric field at the surface of the conductor is perpendicular to the surface
The net electric field with the point charge and the charged sphere, then, is the sum of the fields from the point charge alone and from the sphere alone (except inside the solid part of the sphere, where the field must be zero).
physics.bu.edu /~duffy/PY106/Electricfield.html   (1958 words)

  
  PlanetPhysics: Electric Field   (Site not responding. Last check: )
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 a vector quantity, and the electric field strength is the magnitude of this vector.
planetphysics.org /encyclopedia/ElectricField.html   (562 words)

  
  Electric field - Wikipedia, the free encyclopedia
In physics, an electric field or E-field is an effect produced by an electric charge (or a time-varying magnetic field) that exerts a force on charged objects in the field.
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 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   (1168 words)

  
 Electricity - Wikipedia, the free encyclopedia
Electricity is responsible for many well-known physical phenomena such as lightning, electric fields and electric currents, and is put to use in industrial applications such as electronics and electric power.
Electric charge is a property of certain subatomic particles (e.g., electrons and protons) which interacts with electromagnetic fields and causes attractive and repulsive forces between them.
Electric power is the rate at which electrical energy is produced or consumed, and is measured in watts (symbol: W).
en.wikipedia.org /wiki/Electric   (2105 words)

  
 Electric Field Intensity   (Site not responding. Last check: )
) 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.
The stinky field analogy proves useful in conveying both the concept of an electric field and the mathematics of an electric field.
www.glenbrook.k12.il.us /GBSSCI/PHYS/CLASS/estatics/u8l4b.html   (2098 words)

  
 Physics Tutoring: Electric Fields   (Site not responding. Last check: )
Field lines are an abstract concept (in that they don't really exist and can be difficult to visualize.) We recommend that you use this applet to get a feel for electric field lines with a number of different point charges, of different magnitudes, signs, and values.
The real electric field in each point in space is the net sum (algebraic sum) of the individual fields created by the individual charges at the specific point where the net field is calculated.
Inside the spherical insulator, the electric field is proportional to the distance from the center, and outside the sphere the electric field is inversely proportional to the square of the distance.
www.slcc.edu /schools/hum_sci/physics/tutor/2220/e_fields   (962 words)

  
 Electric Field Lines   (Site not responding. Last check: )
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.
Electric field lines always extend from a positively-charged object to a negatively-charged object, from a positively-charged object to infinity, or from infinity to a negatively-charged object.
www.glenbrook.k12.il.us /gbssci/phys/Class/estatics/u8l4c.html   (1999 words)

  
 PowerPedia:Electromagnetic field - PESWiki
The electric field is produced by non-moving charges and the magnetic field by moving charges (currents); these two are often described as the sources of the field.
An electric field is produced when the charge is stationary with respect to an observer measuring the properties of the charge and a magnetic field (as well as an electric field) is produced when the charge moves (creating an electric current) with respect to this observer.
The electric and magnetic fields are usually described by the use of three-dimensional vector fields.
www.peswiki.com /index.php/Electromagnetic_field   (3357 words)

  
 PowerPedia:Electric field - PESWiki
The electric field or electric field intensity is a vector quantity, and the electric field strength is the field strength magnitude of this vector.
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).
peswiki.com /index.php/PowerPedia:Electric_field   (996 words)

  
 Magnetic and Electric fields
The strength of this electric field equals the battery voltage divided by the distance between the plates (usually measured in meters).
Unlike the electric field, the magnetic field is not fundamental, That is, the concept of a magnetic force is not a separate force, but arises directly from the electric force, if the principles of Einstein's special relativity theory are applied to the electric force.
As with magnetic field current the current from an AC electric field is proportional to the frequency multiplied by the strength.
www.sgha.net /articles/electricandmagneticfields.html   (3383 words)

  
 Electric Forces and Fields
The direction of the net electric field is defined to be in the direction of the force acting on a positive test charge.
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)

  
 FDA/CFSAN: Kinetics of Microbial Inactivation for Alternative Food Processing Technologies -- Pulsed Electric Fields
Some important aspects in pulsed electric field technology are the generation of high electric field intensities, the design of chambers that impart uniform treatment to foods with minimum increase in temperature, and the design of electrodes that minimize the effect of electrolysis.
Electrical conductivity is the inverse of the resistivity, which is defined by the letter r and measured in ohm-meters (W.m).
The average electric field strength is calculated by dividing the peak voltage by the gap distance between the electrodes.
vm.cfsan.fda.gov /~comm/ift-pef.html   (10757 words)

  
 Electric Field: Electrostatics: Plus 2 Physics   (Site not responding. Last check: )
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)

  
 THE ELECTRIC FIELD
From the definition of the electric field it is clear that in order to calculate the field strength generated by a charge distribution we must be able to calculate the total electric force exerted on a test charge by this charge distribution.
The procedure to measure the electric field, outlined in the introduction, assumes that all charges that generate the electric field remain fixed at their position while the test charge is introduced.
Since the density of field lines is proportional to the strength of the electric field, the number of lines emerging from a positive charge must also be proportional to the charge.
teacher.nsrl.rochester.edu /phy122/Lecture_Notes/Chapter23/Chapter23.html   (1453 words)

  
 Magnetic and electric fields exist nearly everywhere, and the
The direction of the force that acts on the proton is the same as the direction of the electric field and the strength of the force is proportional to the strength of the electric field.
Unlike the electric field, the magnetic field is not fundamental, That is, the concept of a magnetic force is not a separate force, but arises directly from the electric force, if the principles of Einstein's special relativity theory are applied to the electric force.
As with magnetic field current the current from an AC electric field is proportional to the frequency multiplied by the strength.
www.trifield.com /magnetic_fields.htm   (3361 words)

  
 Electric Charge and Electric Field
Nm The unit for electric field is N/C. The way the electric field strength (E) of a point charge q weakens with (r) is like the way light intensity weakens as we move away from a light bulb.
The electric field in between the plates and specially away from the edges will essentially be uniform and the electric field lines become parallel.
When electric charges are given to a metal sphere that is located on an insulator, the charges (a) flow to the lowest point of the sphere where the mounting is. (b) slowly distribute, but unevenly.
www.pstcc.edu /departments/natural_behavioral_sciences/Chapter18.htm   (2853 words)

  
 Electric field and C-V behaviour in CNM devices
The field at the backplane is affected by the presence of oxide charge and the potential applied to the entire backplane of the device across the oxide.
Once again, the electric field decreases from a minimum of about 25000V/cm in the region between the electrodes to about 5000V/cm at the back plane of the device, though the field at the edge of the n+ column remains large regardless of depth.
Most importantly, the field strength is significantly smaller in these regions, particularly near the front and back planes of the device, where the field is approximately 5 times smaller than the minimum value seen in the region between the columns.
ppewww.physics.gla.ac.uk /det_dev/activities/threedee/Documents/CNM_initial_sim_results.htm   (2667 words)

  
 Glossary: Electric field
An electric field is an invisible force field created by the attraction and repulsion of electrical charges (the cause of electric flow), and is measured in Volts per meter (V/m).
A static electric field (also referred to as electrostatic field) is an electric field that does not vary with time (frequency of 0 Hz).
The electric field can be compared to the pressure inside a hosepipe when it is connected to the water supply system and the tap is closed.
www.greenfacts.org /glossary/def/electric-field.htm   (355 words)

  
 Conductors in Static Electric Field
The electric field inside the material is still in the + x direction with a magnitude equal to E - Ei.
We have to remember that and electric field is from positive to negative, the external electric field attracted the electrons to its source and repelled the protons away from its source.
As we know that the electric field lines on the surface of a conductor is perpendicular to the surface we can draw the electric field lines between a point charge and a conductor.
www.ece.drexel.edu /courses/ece-e304/e3042/CLICK_HERE_TO_VIEW.htm   (3395 words)

  
 Electric Fields
The electrical field force acts between two charges, in the same way that the gravitational field force acts between two masses.
However, electric field E is a little bit different from gravitational field g.
because the electric field force is inversely proportional to the square of its distance.
library.thinkquest.org /10796/ch12/ch12.htm   (762 words)

  
 CiteULike: Enhanced polymerization of polar macromolecules by an applied electric field with application to mitosis.
In this theoretical study, the relative probability of polymerization of a polar protein species is calculated in the presence and absence of an electric field.
There is a significant enhancement of polymerization in the presence of an electric field, which increases as the size of the attachment site decreases.
We conclude that a cytoplasmic pool of suitable proteins will rapidly polymerize if an electric field is applied, while remaining in a random configuration in the absence of a field.
www.citeulike.org /user/rubendrr/article/388943   (0 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   (428 words)

  
 Electric Field   (Site not responding. Last check: )
Electric Field (E) is a property of space induced by the presence of electric charge in the vicinity.
Definition: Electric Field at a point in space is the net Force that exerted by all the other charges in the vicinity on a unit point charge put there.
Since field is force per unit charge it’s SI units are SI unit of force divided by SI units of charge.
physics.bgsu.edu /~stoner/P202/efield/tsld002.htm   (181 words)

  
 Learn more about Electric field in the online encyclopedia.   (Site not responding. Last check: )
In physics, an electric field is the effect produced by the existence of an electric charge, such as an electron, ion, or proton, in the volume of space or medium that surrounds it.
A field, in this context, means a vector which is dependent on another vector - a vector valued vector function.
This is what is meant when it is said that the electric field is "linear".
www.onlineencyclopedia.org /e/el/electric_field.html   (342 words)

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