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Topic: Point charge

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	Lab Point Charge
		To investigate the dependence of the electrostatic potential on the distance from the point charge.
		Discussion: In this experiment, the potential V near a point charge is expected to depend on the distance r as V = B + A ln r, where A and B are constants and "ln" is the natural logarithm (i.
		Put the positive terminal on the point charge, the negative terminal on the outer circle.
	www.emporia.edu /physics/keithron/collegelab2/point_chg.htm (299 words)

	The Field of A Moving Point Charge (Site not responding. Last check: )
		Circular: the charge moves in a circle, experiencing centripetal accelaration.
		When the charge moves at relativistic speed, the electric field is concentrated near the pole, and consequently the field lines are shifted.
		Notice That when the charge is accelerated, because the field lines must be continuous, it is forced in a direction almost perpendicular to the the direction of propogation.
	www.cco.caltech.edu /~phys1/java/phys1/MovingCharge/MovingCharge.html (279 words)

	Point Charge Repelled By A Charged Sphere
		A point charge represented by the small aluminum sphere is repelled by a large sphere.
		The point charge carries a charge which is 1/50 of that on the large sphere.
		The point charge is initially moving radially toward the large sphere at 9 radii (of the large sphere), with enough energy to reach 1.5 radii (only 0.5 radii above its surface), at which point it reverses direction.
	web.mit.edu /jbelcher/www/rep.html (157 words)

	Outline - Electric Fields- Physics 106
		For r ≥ R, all the charge acts as though it were a point charge at the center of the sphere.
		If positive charge q is placed inside the sphere, electrons move in such a way to make the electric field inside the sphere equal to zero and the positive charge +q on the outside of the conducting sphere.
		Electrons from the spherical conducting shell are drawn towards the positive charge on the sphere, leaving the inner surface of the shell with a negative charge -q, the outer surface of the conducting spherical shell positively charge +q and no electric field inside the conducting shell.
	www.wellesley.edu /Physics/phyllisflemingphysics/106_o_electric.html (1426 words)

	CSERD: Electric Fields from Point Charges
		The field around a single positive point charge points away from the charge, and the field strength is greater close to the charge.
		The field around a single negative point charge is similar to a positive point charge, except the field points towards the charge.
		The fields from the two charges cancel each other out at the halfway point between the two charges, so the field strength would be high near the first charge, drop to zero as you move towards the second charge, and at the halfway point between the two charges start to rise again.
	www.shodor.org /refdesk/Resources/Activities/PointCharges/lessonplan.php (777 words)

	Problem Set - Electric Fields - Physics 106
		Charge Q is distributed uniformly throughout a sphere of radius R (Fig.
		Point P in the figures is the same distance from the center of each sphere.
		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/n106_p_electric.html (1012 words)

	PIC Plasma Simulation
		Each mesh point specifies a location to which the fields and charge densities are assigned after solving the discretised field equations and the discretised equation of motion; the cell itself specifies a volume through the boundaries of which the current densities are calculated.
		The total charge assigned to the mesh point is divided by the volume of the mesh cell to arrive at the value of p for that mesh point.
		The charge assigned to a mesh point is thus a fraction of the charge carried by the particle.
	www.geocities.com /letapk/pic.html (3311 words)

	Electric current
		Electric current is the rate of charge flow past a given point in an electric circuit, measured in coulombs/second which is named amperes.
		The influence of charges is characterized in terms of the forces between them (Coulomb's law) and the electric field and voltage produced by them.
		Although it is electrons which are the mobile charge carriers which are responsible for electric current in conductors such as wires, it has long been the convention to take the direction of electric current as if it were the positive charges which are moving.
	hyperphysics.phy-astr.gsu.edu /hbase/electric/elecur.html (698 words)

	Electric Charge
		When a negatively charged rod is placed close to the neutral metal sphere the (negatively) charged electrons in the sphere are repelled to the far side of the sphere, leaving the atoms on the near side positively charged owing to their missing electrons.
		Although the charges (on the electrons) are tightly bound to the atoms in an insulator they are free to move slightly within the atom.
		Since opposite charges attract and the positive charges are closer to the comb than the negative charges, the piece of paper is attracted to the comb.
	www.physics.sjsu.edu /becker/physics51/elec_charge.htm (1732 words)

	Physics 151 Lecture 2 - Static Electricity - The Electric Field
		Since we have already seen how one point charge (the charge, say on an elementary particle) can exert a force on a second (see the previous lecture), we should state that the electric field produced by a positive (negative) point charge goes radially outward (inward) in all directions from (toward) the charge.
		If we understand how charge is distributed over an object and if the object and its charge distribution have a high degree of symmetry, then we can easily calculate the electric field due to that object, and hence the force it can produce on other charged objects, by the usual techniques of integral calculus.
		In other words, if h is big, then the point where we want to calculate the field is very far away from the segment and we expect that it will be difficult to tell the difference between the field due to a point charge and the field due to a small line segment.
	dept.physics.upenn.edu /courses/gladney/phys151/lectures/lecture_jan_15_2003.shtml (1673 words)

	Electric Charge
		One coulomb of charge is the charge which would flow through a 120 watt lightbulb (120 volts AC) in one second.
		It might be instructive to examine the amount of charge in a sphere of copper of volume one cubic centimeter.
		Assuming that the net charge resides at the points of the spheres most distant from each other because of the charge repulsion, we can set the force of repulsion equal to the weight of a sphere.
	www.physics.utoledo.edu /~alukasz/ralem/Lecture2.htm (1341 words)

	Electric Charge and Electric Force
		However, when an external charged object is brought close to an object, the coulomb's force of attraction or repulsion between the charged objects distorts the coincidence of the center of the positive and the center of the negative charges.
		When a charged object, with its surrounding electric field, is in the electric field of another charged object, the overlap (or superposition) of the two fields results in the coulomb force of attraction or repulsion between the charges, though the charged objects are separated by some distance.
		By finding the charge on the comb due to this charge transfer, determine the magnitude and direction of the electric field of the comb at a distance of 20 cm from the comb.
	gpc.edu /~pgore/PhysicalScience/electric-charge.html (2757 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.
		The vector indicates the magnitude and direction of the force that a positive test charge would experience at that point (a curved field indicates that the force on a nearby test charge would be different in magnitude and direction).
		Use the vector at points a as a reference and sketch in the electric field vectors for points b and c in each pattern, using colored ink or pencil.
	www.as.wvu.edu /coll03/phys/www/rotter/phys201/6_Electricity/Electric_Forces_and_Fields.htm (1239 words)

	Ch 01
		These charges are fixed to the corners of a square, one to a corner, as shown in the figure.
		For any point along the line perpendicular to the plane of the ring at its center, the distance r is the same for all "point charges" on the ring.
		For points that are not on the line, the distance r will, in general, be different for each "point charge" that makes up the total charge q; therefore, the potential V at that point will not be given by Equation 19.6 with a single value for r.
	www.emory.edu /PHYSICS/Faculty/Benson/142/concepts1/CQ19.htm (2785 words)

	Electrostatics, Point Charges (Site not responding. Last check: )
		The variables to consider are: position of point p relative to the point halfway between the charges, the relative magnitudes of the charges, and the signs on the charges.
		The electric field due to a positive point charge always points away from the charge (to the right when on the right side of it) and the electric field near a negative point charge always points inward toward the charge (to the right when on its left side).
		If the two charges are of the same sign, the net potential will always be a sum of two numbers with the sign on the sum being the same as the sign on the charges.
	www.sage.edu /faculty/vozzof/genphys2/netE.html (427 words)

	The Field of A Moving Point Charge (Site not responding. Last check: )
		When the charge moves at relativistic speed, the electric field is concentrated near the pole, and consequently the field lines are shifted.
		The field lines always point to where the charge is at that instant, if we are within the current sphere of information.
		Notice That when the charge is accelerated, because the field lines must be continuous, it is forced in a direction almost perpendicular to the the direction of propogation.
	www.its.caltech.edu /~phys1/java/phys1/MovingCharge/MovingCharge.html (279 words)

	Point-to-point quotes online. Welcome to Point-to-Point-Quotes.info!
		In most cases, the complete network is setup and maintained by the provider with no charge for installation or equipment.
		One of many advantages of an MPLS based network over networks based on frame relay or point to point circuits, is that MPLS is much more scalable.
		There are almost never build-out charges associated with T1 or bonded T1.
	point-to-point-quotes.info (1081 words)

	Supplementary Notes for PHYS 212: Spring 212
		Electric field of a point-like charge (a charge that doesn’t have structure, a proton or an electron is a good approximation, whereas a charged sphere is the opposite example which is not a point-like.) at a field point P which is located at a point r distance away from the point charge is
		When a charged particle follows the two paths (dotted lines above) depicted in the picture above, the work done by the field is the same for both of the paths.
		Potentials at points that are at equidistance from the charge all have the same potential value.
	www.utm.edu /staff/cerkal/sum212.htm (595 words)

	Physics Tutoring: Electric Fields
		) multiplied by the charge that creates the field and divided by the square of the distance from the charge to the point in which the field is being calculated.
		The solution of the problem is: the point with zero field is at a distance of (2.7 d) from charge q1, or (1.7 d) from charge q2.
		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.
	ww2.slcc.edu /schools/hum_sci/physics/tutor/2220/e_fields (962 words)

	Chapter 16: Electric Charge and Electric Field (Site not responding. Last check: )
		Recognize that all charges are multiple of the fundamental unit of charge, e.
		Emphasize quantization of charge and the elementary unit of charge,e.
		Three point charges, q(1) = +40 nC, q(2) = +70 nC, and q(3) = +50 nC are placed at the vertices of a square that measures 10.0 cm on a side.
	www.wilsonhs.org /benjamin/apphyElectro.htm (500 words)

	The Korea Travel Times
		The points can be charged through payments by credit cards (issued in Korea only) or a Korean mobile or transfer to a KTT bank account.
		Your correct points will be reflected once it is confirmed that the errors are due to a system malfunction.
		The charge will be completed with the selection of the amount of charge and a means of payment and click on [confirmation].
	www.koreatraveltimes.com /company/point_info.asp (1001 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.
		Therefore, two charged plates generate a homogeneous electric field confined to the region between the plates, and no electric field outside this region (note: this in contrast to a single charged sheet which produces an electric field everywhere).
	teacher.nsrl.rochester.edu /phy122/Lecture_Notes/Chapter23/Chapter23.html (1453 words)

	Q-9
		A positive point charge is near a bar of metal. The electric field in the vicinity of the point charge and the bar are shown by the field lines in the figure.
		The physical situation which the diagram corresponds to is a metal bar with a net negative charge near a positive point charge.
		Answer: The net force due to induced polarization is always attractive. In the case shown here, the attraction between the +Q and the nearby (–) charges is larger than the repulsion between the +Q and the further away (+) charges, so the net force is attractive.
	www.colorado.edu /physics/phys2020/phys2020_sp06/ConceptTests/CTChargesEFieldsAnsb.htm (599 words)

	Electric Potential (Site not responding. Last check: )
		When charged particles are moved from one position in an electric field to another position, a new unit of measurement is needed.
		Since B is closer to the charge it is at a higher potential than surface A. Surfaces which connect points that are at the same absolute potential, or voltage, are called equipotential surfaces.
		Charge configurations to check for whether or not net E and/or net V equal zero in the center of a square.
	online.cctt.org /physicslab/content/phyapb/lessonnotes/electrostatics/lessonelectricpotential.asp (1325 words)

	PHYS208 Gauss's Law for a Point Charge
		However here I would like to consider the single point charge as the simplest conceptual situation where Gauss's law may be used for evaluation of the electric field.
		The charge appears the same from any relative angle of observation, thus the electric field at a point will depend only on how far it is away from the point charge.
		Perhaps only a fraction of the charge distribution will be enclosed; furthermore, the charge distribution may not be uniform and an integral may need to be evaluated involving a charge density.
	www.physics.udel.edu /wwwusers/watson/phys208/gauss-point.html (578 words)

	Point Charge & Potential
		Find the speed of a proton at point b that at point a was moving to the right with a speed of 4e5 m/s.
		Find the speed of a proton at point a that at point b was moving to the left with a speed of 4e5 m/s.
		The proton's speed at point c is 4e5 m/s.
	www.fiu.edu /~saulj/Teaching/Physics2/05-ElectricPotential/PntCharge_V.html (120 words)

	Point Charge Attracted To Charged Sphere (Site not responding. Last check: )
		A point charge represented by the small aluminum sphere is attracted to a large sphere.
		The point charge and the large sphere carry electric charges equal in magnitude but opposite in sign.
		The point charge is initially moving radially away from the large sphere at 1.5 radii (of the large sphere), but does not have enough energy to escape, and is pulled back.
	web.mit.edu /jbelcher/www/att.html (157 words)

	Giancoli, Physics : Principles with Applications, 5/E Chapter 17 -- MCAT Study Guide
		If an electron passes from point a to point b, there being a difference in electric potential of 100 volts between the two points, the magnitude of the work done on the electron by the electric field in the space is ___.
		The work required of you to move this proton to point a and it still be at rest is ___ eV.
		The magnitude of the electric potential difference between pairs of labeled points is greatest for the pair of points ___.
	cwx.prenhall.com /bookbind/pubbooks/giancoli/chapter17/multiple2/deluxe-content.html (1319 words)

	Electrostatic fields paper (Site not responding. Last check: )
		Given a point in the plane or a value of the potential V, it is difficult to predict the behavior of the corresponding equipotentials.
		The system of charges can be divided into pairs, then larger and larger groups, and then the entire system that eventually "fall" inside an equipotential and start acting as a single charge.
		The program uses the Euler numerical integration method to generate lines of force; starting from a given point, the line of force is followed pixel by pixel in both directions until a charge is "hit" or it runs away to infinity.
	alumnus.caltech.edu /~muresan/projects/esfields/field.html (2998 words)

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