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Topic: Field (physics)


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  Field (physics) - Wikipedia, the free encyclopedia
Fields are often classified by their behaviour under the symmetry transformations of space, i.e., under rotations and translations.
spinor fields are useful in quantum field theory.
For example, in weather prediction these may be temperature, pressure, humidity, etc. In particle physics, the color symmetry of the interaction of quarks is an example of an internal symmetry of the strong interaction, as is the isospin or flavour symmetry.
en.wikipedia.org /wiki/Field_(physics)   (919 words)

  
 Field strength - Wikipedia, the free encyclopedia
In physics, the field strength of a field is the magnitude of its vector (spatial) value.
In theoretical physics, the field strength is just another name for the curvature form.
For the electromagnetic field, the curvature form is just an antisymmetric matrix whose elements are the electric field and magnetic field: the electromagnetic tensor.
en.wikipedia.org /wiki/Field_strength   (90 words)

  
 Physics Help - Overview, History, Future, Links
Physics (from Greek from φυσικός (phusikos): natural, from φύσις (fysis): Nature) is the science of Nature in the broadest sense.
Physics is very closely related to the other natural sciences, particularly chemistry, the science of molecules and the chemical compounds that they form in bulk.
Below is an overview of the major subfields and concepts in physics, followed by a brief outline of the history of physics and its subfields.
www.physics.teleactivities.net   (1550 words)

  
 Physics Tutoring: Electric Fields   (Site not responding. Last check: 2007-11-07)
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)

  
 Physics 151 Lecture 2 - Static Electricity - The Electric Field   (Site not responding. Last check: 2007-11-07)
The field lines give a general idea of the direction, but it is important to remember that the actual field in 3 dimensions extends to every point in space out to infinity if there are no other charges or matter.
The field lines in the book or in the applet show the general direction of the electric field for various positions around the charges.
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   (1683 words)

  
 Transference as an Interactive Field: Physics and Psychology of
All classical physics is based on the assumption that the interacting particles and fields are independently existent, that is they have an autonomy, separateness, or an inherent existence that is fundamentally free from interactions and conditions.
Finally, the quantum fields are nonlocal and thereby express the deep interconnectedness and mutual interdependence of quantum systems--a kind of interconnectedness that defies a classical characterization in terms of independently existent parts connected by faster than light signals or forces.
Often, this stage is preceded by the analyst experiencing physical symptoms such as stomach ache, headache, chest arousal, etc. When he or she notes this and asks the analysand what is happening in the latter's psyche, they frequently respond that something similar has happened or is happening.
www.lightlink.com /vic/field.html   (9823 words)

  
 PHYSICS OF SPORTS
Newton's 2nd law applies to the shot-put and the discus (2 field events in track) becuase the shotput, an object with a much greater mass than the discus, must be thrown with much more force than the discus to reach the same acceleration.
In field hockey, a sport which is played on grass, moving the ball from one side of the field is much harder than moving an ice hockey puck across an ice rink due to a force called friction
Field hockey player, therefore, must hit the ball with a great amount of force to send it across the field, whereas ice hockey players can easily send a puck gliding across the rink.
www.angelfire.com /mo/PhysicsSports   (528 words)

  
 AllRefer.com - quantum field theory (Physics) - Encyclopedia
quantum field theory, study of the quantum mechanical interaction of elementary particles and fields.
Quantum field theory applied to the understanding of electromagnetism is called quantum electrodynamics (QED), and it has proved spectacularly successful in describing the interaction of light with matter.
Quantum field theory applied to the understanding of the strong interactions between quarks and between protons, neutrons, and other baryons and mesons is called quantum chromodynamics (QCD); QCD has a mathematical structure similar to that of QED.
reference.allrefer.com /encyclopedia/Q/quantumf.html   (240 words)

  
 Amazon.com: Quantum Field Theory in Condensed Matter Physics: Books: Alexei M. Tsvelik   (Site not responding. Last check: 2007-11-07)
Quantum field theory has yet to be put on a rigorous mathematical foundation, but this has not deterred its use in a myriad of applications, with condensed matter physics, the subject of this book, being one of them.
Explicit calculations are done for a bosonic field in an external field using the now ubiquitous mathematical identity that "the determinant of an operator is the exponential of the trace of the logarithm of the operator.
The physics of (1+1)-dimensional quantum systems has turned out to be more of a mathematical playground however, as it turns out to have many experimental manifestations, as the author points out many times.
www.amazon.com /exec/obidos/tg/detail/-/0521589894?v=glance   (1898 words)

  
 PARTICLE PHYSICS, PARTICLE COSMOLOGY, AND FIELD THEORY
Field theory in its various forms (classical, quantum, finite-temperature, conformal, topological) is a powerful mathematical tool that can provide solutions to physical problems in areas as diverse as the interactions of elementary particles, the birth of the universe, and microelectronics.
A field, or classical field, is a mathematical entity which can be thought of as a collection of numbers that tells you something about each point in space-time, such as the temperature at each point in a room.
In models of particle physics, phase transitions are necessary in order to explain how some elementary particles, such as the W boson, could receive its mass and yet not introduce devastating mathematical infinities (such as 1 divided by 0) in the quantum field theory.
www.damtp.cam.ac.uk /user/hep/public.html   (1866 words)

  
 Is Earth's magnetic field failing?
Measurements of the Earth's field show that it is getting weaker, and suggest that we are heading for a field reversal, in which the north and south magnetic poles will swap.
The researchers will also try to observe "saturation", when the flowing fluid does not just produce a magnetic field, but the field in turn controls the flow of the fluid-this is what allows the field to sustain itself.
The second ingredient is flow parallel to the spin axis, creating loops of magnetic field bulging out of the tightly spiralling lines-imagine the kid pulling a single strand of the wound-up gum towards the end of his finger.
www.eurekalert.org /pub_releases/2001-08/ns-iem082201.php   (2020 words)

  
 Electric Field: Electrostatics: Plus 2 Physics   (Site not responding. Last check: 2007-11-07)
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)

  
 MIT OpenCourseWare | Physics
The MIT Department of Physics has been a national resource since the turn of the 20th century.
Alumni of the MIT Department of Physics are to be found on the faculties of the world's major universities and colleges, as well as federal research laboratories and every variety of industrial laboratories.
The MIT Physics Department is one of the largest in the nation, in part because it includes astronomy and astrophysics.
ocw.mit.edu /OcwWeb/Physics   (364 words)

  
 Physics > Quantum Field Theory
In particular, the quantum theory of the electromagnetic field, known as quantum electrodynamics, is one of the most well-tested and successful theories in physics.
The procedure by which quantum fields are constructed from individual particles was introduced by Dirac, and is (for historical reasons) known as second quantization.
In quantum field theories, Hamiltonians are written in terms of either the creation and annihilation operators or, equivalently, the field operators.
www.physics.teleactivities.net /theories/central/quantum_field_theory.htm   (1033 words)

  
 Calphysics Institute: Research
Fundamental physics comprises the attempt to understand the nature of the stable elementary particles (leptons and quarks), the messenger particles (gauge bosons) which mediate the interactions, and the relationship of the four interactions (electromagnetism, weak, strong and gravitational) to each other.
In place of that view, quantum field theory assumes that all of space is filled with a quantum field and interprets all stable particles and the messenger particles as excitations of this field.
We use the term "inertia" deliberately in place of "mass" because in both quantum field theory and in superstring theory there is a postulated mechanism for massless particles to acquire mass from interactions with an hypothesized Higgs field.
www.calphysics.org /research.html   (1257 words)

  
 Physics: Mass, the Higgs boson, and the Higgs field
The godlike importance ascribed to the Higgs particle (or equivalently, the Higgs field) is because the
We think that all of space is filled with this field, and that by interacting with this field, particles acquire their masses.
Without the full context of the theoretical models, all attempts to explain the Higgs field are simplistic, and yet, it seems important to grasp its meaning since this field is so fundamental to our physical universe.
www.p-i-a.com /Magazine/Issue10/Physics_10.htm   (925 words)

  
 Amazon.com: Classical Mathematical Physics : Dynamical Systems and Field Theories: Books: Walter Thirring,E.M. Harrell   (Site not responding. Last check: 2007-11-07)
The treatment of classical fields uses the language of differenial geometry throughout, treating both Maxwell's and Einstein's equations in a compact and clear fashion.
Einstein's Field Equations are used to derive motion in a Schwarzschild field around a large mass.
Therefore the author is justified in neglecting the physics and concentrating on the mathematics; in fact, introducing the mathematical tools using such old friends makes it easier for the reader to fully understand the mathematics, and the way it relates to the physics.
www.amazon.com /exec/obidos/tg/detail/-/0387406158?v=glance   (1560 words)

  
 Field (physics) - Search Results - MSN Encarta   (Site not responding. Last check: 2007-11-07)
Field (physics) - Search Results - MSN Encarta
Physics, major science dealing with the fundamental constituents of the universe, the forces they exert on one another, and the effects of these...
Field (physics), area surrounding an object in which a gravitational or electromagnetic force is exerted on other objects.
uk.encarta.msn.com /Field_(physics).html   (105 words)

  
 Open Directory - Science: Physics: Quantum Mechanics: Quantum Field Theory: Gravitation   (Site not responding. Last check: 2007-11-07)
Cause of gravity and an explanation of field dynamics - An intuitive contribution to the gravity debate.
Gravity as an Effective Field Theory - This is a pedagogical introduction to the treatment of general relativity as a quantum effective field theory.
Physics News Update - Quantum Gravitational States - Quantum gravitational states have been observed for the first time.
dmoz.org /Science/Physics/Quantum_Mechanics/Quantum_Field_Theory/Gravitation   (846 words)

  
 Science: Physics Lesson Plans Index
You can turn a bus ride into a physics experiment that will even have your fellow teachers scratching their heads.
Everyone knows that a weight suspended by a string and taped to the ceiling of the bus will appear to swing backward as the bus speeds up, and forward as it decelerates, due to inertia.
What we really have is a bus full of air sloshing around inside, changing pressure as the bus accelerates, decelerates, or turns, with a balloon trying to get to the area of lowest pressure.
www.teachnet.com /lesson/science/physics   (249 words)

  
 High Field Physics Group   (Site not responding. Last check: 2007-11-07)
For example, at the Ti:sapphire laser wavelength of 800 nm, one period of the carrier field is only 2.7 fs long.
Work with such short pluses is very challenging but also interesting, as even propagation through a few cm of air tends to broaden the pulse considerably, and no shorter event is available to characterize and measure them.
These pulses are interesting for physics because they can be used to measure ultrafast events e.g.
www.phys.ethz.ch /~biegert/hfp_research_ulp.html   (622 words)

  
 Electric Force Fields   (Site not responding. Last check: 2007-11-07)
In physics, a force field is a way to picture the effects that electric charges have on one another.
Try putting down "test" electrons with the mouse to see which way the field points and how strong it is; the line points in the direction in which the electron will move, and the length of the line tells you the strength of the force at its current location.
OK, I get what a force field is (although it's a stretch to think of a force field as a property of empty space).
www.colorado.edu /physics/2000/waves_particles/wavpart3.html   (347 words)

  
 Fundaments of theoretical physics
By this last we mean the effort to reduce all concepts and correlations to as few as possible logically independent basic concepts and axioms.What we call physics comprises that group of natural sciences which base their concepts on measurements; and whose concepts and propositions lend themselves to mathematical formulation.
The larger part of physical research is devoted to the development of the various branches of physics, in each of which the object is the theoretical understanding of more or less restricted fields of experience, and in each of which the laws and concepts remain as closely as possible related to experience.
These spatial states, today called fields, if their geometrical structure and interdependent action were once rightly grasped, would, he was convinced,furnish the clue to the mysterious electromagnetic interactions.
www.phys.lsu.edu /students/mitsuko/Physics/Einstein/einst5.html   (3792 words)

  
 BSCS | Out Of Field Teaching   (Site not responding. Last check: 2007-11-07)
The Research and Evaluation Division at BSCS is conducting a longitudinal study of out-of-field physics teachers in the San Diego City Schools.
Specifically, BSCS is examining the teachers' skill in implementing the 9th-grade physics curriculum as well as their self-efficacy and concerns about physics teaching.
This growth is evident in the quality of the teachers' implementation of the 9th-grade physics curriculum.
www.bscs.org /page.asp?pageid=0|204|210|213&id=0|out_of_field_teaching   (136 words)

  
 Teacher Licensure @ Case   (Site not responding. Last check: 2007-11-07)
Students majoring in Physics who wish to teach physics, but not chemistry, at the high school level may choose to obtain licensure in AYA Physics, rather than AYA Physical Science (Dual-Field: Chemistry and Physics.) Students who wish to choose this option pursue the B.A. program in Physics.
This alternative, which requires 70 hours in the content area (subject area), entails fewer requirements in chemistry than the Dual-Field option, and additional required hours in physics.
Professional education requirements are the same as those for students seeking Physical Science Dual-Field licensure.
www.cwru.edu /artsci/teachlic/tl_physics.htm   (108 words)

  
 The Open Door Web Site : IB Physics : Electric Field Shapes
To draw a diagram showing the shape of an electric field, imagine a small positive charge (a test charge) to be placed in the field at different points.
Wherever the test charge is placed, the force will be directed away from the charge (or towards the charge if it is negative).
At the centre of this field is a place where the magnitude of the electric field strength is
www.saburchill.com /physics/chapters/0029.html   (174 words)

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