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Topic: Lorentz force


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  Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal
In physics, the Lorentz force is the force exerted on a charged particle in an electromagnetic field.
The Lorentz force is one of the original eight Maxwell's equations (equation D) and it is the solution to the differential form of Faraday's Law.
The Lorentz force equation can be written in covariant form in terms of the field strength tensor.
www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Lorentz_force   (425 words)

  
  Lorentz force and superconductivity   (Site not responding. Last check: )
To change the velocity of an electron requires that a Lorentz force acts on it, through an electric or a magnetic field.
We point out that within the conventional understanding of superconductivity electrons appear to change their velocity in the absence of Lorentz forces.
This hypothesis is consistent with the theory of hole superconductivity.
www-physics.ucsd.edu /~jorge/abstracts/lorentz.html   (73 words)

  
 [No title]
Fundamentally, the electromagnetic force density is the result of forces acting on those microscopic particles embedded in the material that are charged, or that have electric or magnetic dipole moments.
In a given region, the force density resulting from the positively charged particles tends to be canceled by that due to the negatively charged particles, and the net force density is therefore proportional to the difference in absolute magnitudes of the charge densities.
The force on the dipole shown by the inset lends further credence to the dipolar origins of the force density.
web.mit.edu /6.013_book/www/chapter11/11.9.html   (3178 words)

  
 Email Template   (Site not responding. Last check: )
The appropriate force equations are explored for a mass particle in a gravitational orbit and for a charged particle in an electrostatic orbit.
I favored the GRW force law because it allowed the direction of the forces to be determined by the gradient of the magnetic lines of force—which in my limited experience allowed a torque to be present between two magnetic sources.
The integral of the force across the diameter of the orbit corresponds precisely to the energy difference between the alignment of the spin velocity with the translation velocity and against the translation velocity.
www.egtphysics.net /Ron1/Lorentz.htm   (5410 words)

  
 The Lorentz force and a moving charge in the centre of the circle
The Lorentz force that a circular current carrying conductor exerts upon a moving charge in the centre of the circle
The x-projection of the electro-relative force parallel to
Thus, the y-projections of the electro-relative forces, perpendicular and parallel to the velocity
www.ctv.es /USERS/positivo/lorentz.html   (468 words)

  
 No Title
The armature is free to slide along the rails, so the Lorentz force causes it to slide along the rails, away from the power source.
Use Newton's equation of motion to relate the Lorentz force law to the mass and acceleration of the armature.
The force on the armature is also equal to the mass of the armature times the acceleration of the armature (Newton's 2nd law of motion, F=ma).
www.railgun.org /physics   (1716 words)

  
 Magnetic Fields and Lorentz Force - Flaw in Relativistic Theory
According to the relativistic view of electrodynamics, the force on a particle with charge q and velocity v in a magnetic field B, i.e.
In view of this lack of a physically relevant definition of the velocity v in the Lorentz force, it is therefore not surprising that the derivation of the relativistic electrostatic force in the corresponding reference frame is actually also incorrect as it violates the law of charge conservation:
On the other hand, it is hard to believe that the apparent velocity dependence of the electrostatic force observed in accelerators for instance is not real, so one would have to assume the existence two components which are identical for the near field but are different in the indicated sense for the far field.
www.physicsmyths.org.uk /lorentzforce.htm   (608 words)

  
 Statistical height-dependent relative importance of the Lorentz force and Joule heating in generating atmospheric ...
Statistical height-dependent relative importance of the Lorentz force and Joule heating in generating atmospheric gravity waves in the auroral electrojets
Under this height the Lorentz force is relatively important.
Citation: Yuan, Z. Fujii, S. Nozawa, and Y. Ogawa (2005), Statistical height-dependent relative importance of the Lorentz force and Joule heating in generating atmospheric gravity waves in the auroral electrojets, J.
www.agu.org /pubs/crossref/2005/2005JA011315.shtml   (319 words)

  
 Physics Myths and physics facts
Buoyancy: Although Archimedes' principle gives the force on a buoyant object, it is generally not recognized that this does not determine the related acceleration of the object in the usual way over Newton's first law.
Gravitation: Modern theories of gravitation assume that the gravitational force between two masses is not an instantaneous interaction but is communicated by field quanta (gravitons) moving with the speed of light.
However, the usual interpretation of the observed amplification is problematic due to a fundamental conceptual inconsistency with the assumed process of stimulated (induced) emission and also with the assumption that the optical resonator should enable all atoms in the light emitting medium to radiate in phase.
www.physicsmyths.org.uk   (8102 words)

  
 Lorentz force
This Java applet demonstrates the Lorentz force, exerted on a current-carrying conductor swing in the magnetic field of a horseshoe magnet.
The other two buttons ("Reverse current" and "Turn magnet") make it possible to change the direction of the current respectively of the magnetic field.
If the corresponding checkboxes are selected, the applet will indicate the conventional direction of current (red arrows), the magnetic field lines (blue) and the Lorentz force (fl arrow).
www.walter-fendt.de /ph11e/lorentzforce.htm   (88 words)

  
 Lorentz Force Law and Right Hand Rule
The ions in the water will be attracted to their respective electrodes (opposite charges attract) creating a situation where the Lorentz force law can be applied.
A better way to figure out the direction of the force is to construct a set of axes, as shown in fig.1, and use the scalar equation of the Lorentz force law
Thus the sign of the resultant force is just found by multiplying all the signs together, according to F = QvB, and the direction is found from the axes you constructed.
www.physics.ubc.ca /~outreach/phys420/p420_96/reg/mhd_set.htm   (400 words)

  
 Magnetic forces
The magnetic field B is defined from the Lorentz Force Law, and specifically from the magnetic force on a moving charge:
The force is perpendicular to both the velocity v of the charge q and the magnetic field B. The magnitude of the force is F = qvB sinθ where θ is the angle
The electric force is straightforward, being in the direction of the electric field if the charge q is positive, but the direction of the magnetic part of the force is given by the right hand rule.
hyperphysics.phy-astr.gsu.edu /hbase/magnetic/magfor.html   (307 words)

  
 Lorentz Force   (Site not responding. Last check: )
This Java applet demonstrates the Lorentz force, exerted on a current-carrying conductor swing in the magnetic field of a horseshoe magnet.
If the corresponding checkboxes are selected, the applet indicates the technical current direction (blue arrows), the magnetic field lines (violet) and the Lorentz force (fl arrow).
This web site is designed and maintained by Science Joy Wagon and may not be reproduced or redistributed without written permission from Science Joy Wagon.
www.sciencejoywagon.com /physicszone/lesson/otherpub/wfendt/lorentzforce.htm   (111 words)

  
 EcEn 360 Tutorials-Maxwell's Law-Lorentz Force Equation   (Site not responding. Last check: )
Lorentz found that a magnetic field would exert a force on an electric charge only if it was moving.
He then found that the force on a moving charge is proportional to the strength of the magnetic field and the speed of the charge.
The direction of the force is always perpendicular to both the magnetic field and the velocity of the charge.
www.ee.byu.edu /em/lorentz.htm   (0 words)

  
 Lorentz Forces and Other Magnetic Effects Relating to Biology
Lorentz Forces: When an atom gains or loses an electron in a chemical reaction, it becomes electrically charged and is called an ion.
For the Lorentz calculation, we have assumed a sodium ion moving with blood under the influence of a rare earth magnet.
One approach is to assume the Lorentz force pushes the ion halfway across the blood vessel or about 1 mm.
members.aol.com /magpulser/Lorentz.htm   (0 words)

  
 Electromagnetism: Maxwell's Equations and their Solutions - Numericana
The expression of the Lorentz force introduced here defines dynamically the fields which are governed by Maxwell's equations, as presented further down.
electrostatic force between two charged particles is proportional to each charge, and inversely proportional to the square of the distance between them.
The Lorentz force transfers energy from the field to the charge carriers.
home.att.net /~numericana/answer/maxwell.htm   (3916 words)

  
 Electricity and Magnetism
Force on a charge q moving through an external magnetic field B with a velocity v, is given by
The force on the charge is towards the center of a circle.
The force on an element of the wire of length dl is given by
scitec.uwichill.edu.bb /cmp/online/P10D/sodha/lecture13/lect13.htm   (435 words)

  
 Magnetic Force
Since this force exists whether or not the charges are moving, it is sometimes called the electrostatic force.
Magnetism could be said to be an electrodynamic force, but it rarely is. The combination of electric and magnetic forces on a charged object is known as the Lorentz force.
This formula for the magnetic force on a current carrying wire is the basis for the experiment defining the fundamental unit of electric current in the SI system, the ampère.
hypertextbook.com /physics/electricity/lorentz   (523 words)

  
 Lorentz force and superconductivity   (Site not responding. Last check: )
To change the velocity of an electron requires that a Lorentz force acts on it, through an electric or a magnetic field.
We point out that within the conventional understanding of superconductivity electrons appear to change their velocity in the absence of Lorentz forces.
This hypothesis is consistent with the theory of hole superconductivity.
physics.ucsd.edu /~jorge/abstracts/lorentz.html   (73 words)

  
 Wisp Unification Theory - almost the theory of everything
The force will be calculated by stationary and moving observers, first with the wire at rest in absolute wisp space, and then with the wire and observer moving.
The effects of force and jiggle dilations apply to all moving charges, but because the positive ions are moving slower than the electrons through wisp space, their dilation effects are smaller.
We have proven that all observers measure electromagnetic forces as having the same magnitude in all inertial frames, and so wisp theory proves that the Lorentz force law is valid in an ether medium – wisp space.
www.kevin.harkess.btinternet.co.uk /wisp_ch_8/wisp_ch_8.html   (1383 words)

  
 The Lorentz force
It seems reasonable, therefore, that the force exerted on the wire when it is placed in a magnetic field is simply the resultant of the forces exerted on these moving charges.
This formula implies that the magnitude of the magnetic force exerted on a moving charged particle is the product of the particle's charge, its velocity, the magnetic field strength, and the sine of the angle subtended between the particle's direction of motion and the direction of the magnetic field.
The magnetic force, however, is perpendicular to both the local magnetic field and the particle's direction of motion.
farside.ph.utexas.edu /~rfitzp/teaching/302l/lectures/node57.html   (0 words)

  
 basics
The basic physical principle underlying the Hall effect is the Lorentz force.
When an electron moves along a direction perpendicular to an applied magnetic field, it experiences a force acting normal to both directions and moves in response to this force and the force effected by the internal electric field.
Electrons subject to the Lorentz force initially drift away from the current line toward the negative y-axis, resulting in an excess surface electrical charge on the side of the sample.
www.physics.ucf.edu /~delbarco/html/basics.html   (307 words)

  
 The Lorentz Force
In the classical case for a point charge, beta is zero and the E = k e/r^2, so the Lorentz force simplifies to Coulomb's law.
This combination of differential quaternion operator, quaternion potential and quaternion 4-velocity generates the covariant form of the Lorentz operator in the Lorenz gauge, minus a factor of the charge e which operates as a scalar multiplier.
By writing the covariant form of the Lorentz force as an operator acting on a potential, it may be possible to create other laws like the Lorentz force.
world.std.com /~sweetser/quaternions/EandM/LorentzForce/LorentzForce.html   (311 words)

  
 Session DB - Active Control.
The direct effect of modifying the turbulent boundary layer with a spatially- and temporally-varying Lorentz force for the purpose of drag reduction was explored using a buoyant axisymmetric body.
Several different forms of the Lorentz force were applied, including an oscillating spanwise force, wall-normal force convecting downstream, and wall-normal force proportional to a weighted sum of the wall-shear stresses.
The Lorentz force actuator is comprised of a pair of magnets and a pair of electrodes and produces a volumetric body force.
flux.aps.org /meetings/BAPSDFD96/abs/S430.html   (1619 words)

  
 Electromagnetism
The classic use of the Lorentz force in the Chemistry Laboratory is with the mass spectrometer, figure 5.1.2.
Since the force is always at right angles to v and B the particle must follow a circular path.
To determine the magnetic force on an ionised atom or molecule the magnetic field must be known.
www.ch.ic.ac.uk /local/physical/mi_5.html   (2985 words)

  
 PowerPedia:Lorentz force - PESWiki
In physics, the Lorentz force is the force exerted on a charged particle in an electromagnetic field.
The Lorentz force can act on a current carrying conductor, in this case called Laplace Force, by the interaction of the conduction electrons with the atoms of the conductor material.
The Lorentz force equation can be written in covariant form in terms of the field strength tensor (cgs units).
peswiki.com /energy/PowerPedia:Lorentz_force   (405 words)

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