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Sun: Solar Activities -- Flares, CMEs
Sun: Solar Activities -- Flares, CMEs

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Module 8 Electromagnetism

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Tutorial 1 Sept. 22 - McMaster University > ECE

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... chamber In Fig.2 is presented the construction plan of the current path which includes the output terminals A, B, the conducting bars 1,2, the brake contacts 3 (lasting contacts) and 4 (arc brake contacts), the slopes 5, 6 placed in the arcing chamber CS. Within the arcing chamber there are the ferr ...
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Geometrical Representation of the Schrodinger Equation for Solving

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... how they work? One of the principles behind these machines is called electromagnetism. With this kit, you will learn the meaning of electromagnetism and make your own electromagnet and experiment with its strength, practicing being an electrical engineer. What is electromagnetism? In 1819, a scienti ...
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... Many electrical appliances use the circular motion produced by their electric motor. Put ticks ( ) in the boxes next to all the appliances in the list which have an electric motor. ...
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Lecture Notes 18: Magnetic Monopoles/Magnetic Charges; Magnetic Flux Quantization, Dirac Quantization Condition, Coulomb/Lorentz Force Laws for Electric/Magnetic Charges, Duality Transformations

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... The two kinds of forces we are commonly aware of are gravitational and electromagnetic. The electromagnetic forces acting within and between atoms are immensely stronger than the gravitational forces acting between them. On an atomic scale, electric forces between oppositely charged protons and elec ...
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to go to any of the pages listed below, click on its title

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Electromagnetic Induction Experiment

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... I pull out 3 of the materials used in the Static Pickup Game center and have the class sit on the carpet in front of me, remaining in their center groups of 4. I hold up the first object used in that center, the cotton ball. I ask the students why did we use a cotton ball to charge up the comb and t ...
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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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