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Powerpoint 3
Powerpoint 3

Michael Faraday (1791-1867) The laws of electricity and magnetism
Michael Faraday (1791-1867) The laws of electricity and magnetism

... • While attempting to explain a discovery to the Prime Minister of Great Britain he was asked, 'But, after all, what use is it?' Faraday replied, 'Why sir, there is the probability that you will soon be able to tax it.' • When the Prime Minister asked of a new discovery, 'What good is it?', Faraday ...
Course Specifications
Course Specifications

... Contents Chapter I : Electric Interactions Charge, Coulomb's law, electric field, quantisation of the electric charge, electrical structure of matter, the atom, electric potential, energy relations in an electric field, electric current, electric dipole, higher order electric multipoles. Chapter II ...
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induced current. - University of Iowa Physics
induced current. - University of Iowa Physics

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... negative side of the battery, through each light bulb, and back to the positive side of the battery. If you take out a bulb, this causes the other bulb to go out too. Parallel circuits have an advantage over series circuits. They have more than one path for the current to flow through. The second bu ...
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Effects of high static magnetic fields in magnetic resonance imaging

... examination table was moved back and forth. As motion in a static magnetic field causes electric fields and currents in living tissues (e.g. brain of moving health personnel) it is important to determine if movement has an influence. The results of the cognitive tests were not significantly differen ...
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... (1) Definition of Magnetic Flux: For a flat surface S with area vector A ~ subjected to a uniform magnetic field B, ~ with angle surface and finite surface area A ≡ |A|, ~ B) ~ enclosed between A ~ and B, ~ the magnetic flux through S is defined as: θ ≡ 6 (A, Φm ≡ AB cos(θ) . ~ which are not uniform ...
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... Electricity is often generated a long way from where it is used, and is transmitted long distances through power lines. Although the resistance of a short length of power line is relatively low, over a long distance the resistance can become substantial. A power line of resistance R causes a power l ...
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Magnetic core

A magnetic core is a piece of magnetic material with a high permeability used to confine and guide magnetic fields in electrical, electromechanical and magnetic devices such as electromagnets, transformers, electric motors, generators, inductors, magnetic recording heads, and magnetic assemblies. It is made of ferromagnetic metal such as iron, or ferrimagnetic compounds such as ferrites. The high permeability, relative to the surrounding air, causes the magnetic field lines to be concentrated in the core material. The magnetic field is often created by a coil of wire around the core that carries a current. The presence of the core can increase the magnetic field of a coil by a factor of several thousand over what it would be without the core.The use of a magnetic core can enormously concentrate the strength and increase the effect of magnetic fields produced by electric currents and permanent magnets. The properties of a device will depend crucially on the following factors: the geometry of the magnetic core. the amount of air gap in the magnetic circuit. the properties of the core material (especially permeability and hysteresis). the operating temperature of the core. whether the core is laminated to reduce eddy currents.In many applications it is undesirable for the core to retain magnetization when the applied field is removed. This property, called hysteresis can cause energy losses in applications such as transformers. Therefore, 'soft' magnetic materials with low hysteresis, such as silicon steel, rather than the 'hard' magnetic materials used for permanent magnets, are usually used in cores.
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