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Physic..
Physic..

... formulas have in common: All the units “agree” with each other. Distances are always given in meters, time is given in seconds, and speed is given in meters per second. The preceding formulas for area will not work as shown if A is expressed in square inches and d is expressed in feet. However, the ...
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Spins in few-electron quantum dots

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... A special type of tension-loaded line element is the entirely flexible cable. Cables have no “natural” shape, and adapt to the load. In Section 14.1.1, we look at the behaviour of cables subject to a system of parallel forces. In Section 14.1.2, we show that the shape of a cable with respect to its c ...
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... out so far and at correction of important errors in its earlier historical and methodological assessments. The latter concern the general approach to Gilbert, who has, for example, been seen as a 'natural magician', but also specific mistakes such as the widely held view that his conception of magne ...
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... The present work answers this need, and since 2002, it has become a textbook in Transilvania University of Braşov and a number of higher schools from Braşov area. The text-book represents a first course in electrical engineering materials and devices – in English language - suitable for a one- or tw ...
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... filter is magnetized by an external electro or permanent magnet. It allows the separation of small particles down to nanometer scale and works at high volume flow. For instance, it is not a very wide-spread technology. One of the main reasons is the fact that few systems in nature are magnetic. A ne ...
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Charge, spin and orbital order in the candidate multiferroic material

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Influence of chemical substitutions and the oxygen content on
Influence of chemical substitutions and the oxygen content on

... many elements among which Nb possesses the highest transition temperature Tc of 9.2 K (at ambient pressure). The first attempt to describe the electrodynamic properties of the superconducting state was the phenomenological London theory [2]. In 1950 the phenomenological Ginzburg-Landau (GL) theory o ...
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Electromagnetism



Electromagnetism is a branch of physics which involves the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles. The electromagnetic force usually shows electromagnetic fields, such as electric fields, magnetic fields, and light. The electromagnetic force is one of the four fundamental interactions in nature. The other three fundamental interactions are the strong interaction, the weak interaction, and gravitation.The word electromagnetism is a compound form of two Greek terms, ἤλεκτρον, ēlektron, ""amber"", and μαγνῆτις λίθος magnētis lithos, which means ""magnesian stone"", a type of iron ore. The science of electromagnetic phenomena is defined in terms of the electromagnetic force, sometimes called the Lorentz force, which includes both electricity and magnetism as elements of one phenomenon.The electromagnetic force plays a major role in determining the internal properties of most objects encountered in daily life. Ordinary matter takes its form as a result of intermolecular forces between individual molecules in matter. Electrons are bound by electromagnetic wave mechanics into orbitals around atomic nuclei to form atoms, which are the building blocks of molecules. This governs the processes involved in chemistry, which arise from interactions between the electrons of neighboring atoms, which are in turn determined by the interaction between electromagnetic force and the momentum of the electrons.There are numerous mathematical descriptions of the electromagnetic field. In classical electrodynamics, electric fields are described as electric potential and electric current in Ohm's law, magnetic fields are associated with electromagnetic induction and magnetism, and Maxwell's equations describe how electric and magnetic fields are generated and altered by each other and by charges and currents.The theoretical implications of electromagnetism, in particular the establishment of the speed of light based on properties of the ""medium"" of propagation (permeability and permittivity), led to the development of special relativity by Albert Einstein in 1905.Although electromagnetism is considered one of the four fundamental forces, at high energy the weak force and electromagnetism are unified. In the history of the universe, during the quark epoch, the electroweak force split into the electromagnetic and weak forces.
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