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Ethan Frome
Ethan Frome

... Therefore, the area inside the pail is free of the electrostatic fields associated with these charges. The 'Faraday Cage' (area inside) is free of an electrostatic field only when the charges have moved to arrange themselves to suit the surrounding surfaces and are static (stationary). In the opposi ...
© DISNEY 2012
© DISNEY 2012

... but generating electricity also requires the use of Earth’s natural resources. Most of our electricity comes from the burning of fossil fuels, such as oil, coal and natural gas. This can pose some challenges: since our supply is limited, we must use fossil fuels wisely. Fossil fuels also release pol ...
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... caused by a magnetic force. That voltage could drive a current. Historically, it was very shortly after Oersted discovered currents cause magnetic fields that other scientists asked the following question: Can magnetic fields cause currents? The answer was soon found by experiment to be yes. In 1831 ...
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... very shortly after Oersted discovered currents cause magnetic fields that other scientists asked the following question: Can magnetic fields cause currents? The answer was soon found by experiment to be yes. In 1831, some 12 years after Oersted’s discovery, the English scientist Michael Faraday (179 ...
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... Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. ...
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© DISNEY 2012

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... separated from each other by small particles on their surface. These particles acted as idle wheels enabling neighbouring vortices to rotate in the same sense. In conductors these idle wheels were able to move from vortex to vortex through the conducting material, thus constituting a conduction curr ...
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... In spite of its importance and solid theoretical underpinnings, the formation of electromagnetic (EM) radiation by accelerating charges is still a source of wonder if not bewilderment. The conceptual understanding of how radiation is generated is the subject of this paper. Maxwell’s equations, toget ...
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Eddy current

Eddy currents (also called Foucault currents) are circular electric currents induced within conductors by a changing magnetic field in the conductor, due to Faraday's law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field. They can be induced within nearby stationary conductors by a time-varying magnetic field created by an AC electromagnet or transformer, for example, or by relative motion between a magnet and a nearby conductor. The magnitude of the current in a given loop is proportional to the strength of the magnetic field, the area of the loop, and the rate of change of flux, and inversely proportional to the resistivity of the material.By Lenz's law, an eddy current creates a magnetic field that opposes the magnetic field that created it, and thus eddy currents react back on the source of the magnetic field. For example, a nearby conductive surface will exert a drag force on a moving magnet that opposes its motion, due to eddy currents induced in the surface by the moving magnetic field. This effect is employed in eddy current brakes which are used to stop rotating power tools quickly when they are turned off. The current flowing through the resistance of the conductor also dissipates energy as heat in the material. Thus eddy currents are a source of energy loss in alternating current (AC) inductors, transformers, electric motors and generators, and other AC machinery, requiring special construction such as laminated magnetic cores to minimize them. Eddy currents are also used to heat objects in induction heating furnaces and equipment, and to detect cracks and flaws in metal parts using eddy-current testing instruments.
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