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When a charged particle moves near a bar magnet, the magnetic
When a charged particle moves near a bar magnet, the magnetic

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Exam 1

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... The inverse of resistivity is defined to be the conductivity The resistivity of a material is temperature dependent with the resistivity increasing as the temperature increases This is due to the increased vibrational motion of the atoms the make up the lattice further inhibiting the motion of the c ...
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... know them – specifically the noble gasses (Group VIIIA). Other atoms will combine with themselves, such as O2 (probably heard of that!), N2, H2, S8, Cl2, F2, Br2, I2. By in large, atoms like to hang out together and form molecules. A molecule is a group of two or more atoms held together in a defini ...
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Strong CP violation in hot QCD: from heavy ion collisions to cosmology

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W12.00 Static Electricity Worksheet 1. How much force do two 1C

... 3. A 1µC charge and a 4µC charge are 12 meters apart.  Where on the straight line  connecting them can a ‐1µC charge be placed and have no net force exerted on it?   Where can a +3µC charge be placed and have no net force acting on it?  ...
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Physics News from the AIP No 2, Term 1 2005

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Elementary particle



In particle physics, an elementary particle or fundamental particle is a particle whose substructure is unknown, thus it is unknown whether it is composed of other particles. Known elementary particles include the fundamental fermions (quarks, leptons, antiquarks, and antileptons), which generally are ""matter particles"" and ""antimatter particles"", as well as the fundamental bosons (gauge bosons and Higgs boson), which generally are ""force particles"" that mediate interactions among fermions. A particle containing two or more elementary particles is a composite particle.Everyday matter is composed of atoms, once presumed to be matter's elementary particles—atom meaning ""indivisible"" in Greek—although the atom's existence remained controversial until about 1910, as some leading physicists regarded molecules as mathematical illusions, and matter as ultimately composed of energy. Soon, subatomic constituents of the atom were identified. As the 1930s opened, the electron and the proton had been observed, along with the photon, the particle of electromagnetic radiation. At that time, the recent advent of quantum mechanics was radically altering the conception of particles, as a single particle could seemingly span a field as would a wave, a paradox still eluding satisfactory explanation.Via quantum theory, protons and neutrons were found to contain quarks—up quarks and down quarks—now considered elementary particles. And within a molecule, the electron's three degrees of freedom (charge, spin, orbital) can separate via wavefunction into three quasiparticles (holon, spinon, orbiton). Yet a free electron—which, not orbiting an atomic nucleus, lacks orbital motion—appears unsplittable and remains regarded as an elementary particle.Around 1980, an elementary particle's status as indeed elementary—an ultimate constituent of substance—was mostly discarded for a more practical outlook, embodied in particle physics' Standard Model, science's most experimentally successful theory. Many elaborations upon and theories beyond the Standard Model, including the extremely popular supersymmetry, double the number of elementary particles by hypothesizing that each known particle associates with a ""shadow"" partner far more massive, although all such superpartners remain undiscovered. Meanwhile, an elementary boson mediating gravitation—the graviton—remains hypothetical.
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