4800-058 Guimarães‚ Portugal delfimpedrosa@gmail.com‚ sena@dei.uminho.pt Abstract. Spinning a wire loop within a uniform magnetic field in a convenient fashion induces a voltage between the loop terminals. This effect can be used to build an electric power generator‚ such as the one described in this paper. A coil attached to a shaft spins within the magnetic field of a "U" shaped magnet. Three conveniently designed conductive disks allow the electrical load of the generator to be fed
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1. Rationale of the study Our new technology the energy transfer wherein energy can be transferred from a source to a load via coupled magnetic resonance in the non radiative near field that can be used in some equipment that used in some electric energy as a source like the electric vehicles (EVs). We can use this energy transfer as a charger to EVs by microwave beams and laser beams to realize the remote energy supply using directional antenna. However when there is a obstruction in the path
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Electromagnetism and it’s Impact on our Health Car By: Dalia Newman Course: Grade 12 Physics Teacher: Mrs. Chocron Due: Friday April 15 2011 Electromagnetism and it’s Impact on our Health Care Electromagnetism is one of the four fundamental interactions of nature. It is the force that causes the interaction between electrically charged particles; the areas in which this happens are called electromagnetic fields. It
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variable gap magnet there were two small magnetic disks. One arm of the magnet was unscrewed and removed from its housing. A meter stick was placed on the and the arm was on its side parallel to the meter stick. The Gauss-Tesla meter was used to measure the field strength of the magnet. The probe attached to the meter was perpendicular to the meter stick. There were 4 steps to this process: a. The field strength was measured with the probe flat against the magnetic disk b. The probe was moved one centimeter
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phone. In his exhausted state‚ he wished the phone would just begin charging itself as soon as it was brought into the house. So‚ Soljačić started searching for ways to transmit power wirelessly. Soljačić found magnetic resonance a promising means of electricity transfer because magnetic fields travel freely through air yet have little effect on the environment or‚ at the appropriate frequencies‚ on living beings. Working with MIT physics professors John Joannopoulos and Peter Fisher and three students
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Microstrip‚ Stripline‚ and CPW Design Iulian Rosu‚ YO3DAC / VA3IUL‚ http://www.qsl.net/va3iul In the first years of microwave development the Rectangular Waveguide become the dominant waveguide structure largely because high-quality components could be designed using it. One of the main issues was its narrow bandwidth due to the cut-off frequency characteristic. Later‚ researchers try to find components that could provide greater bandwidth and possible miniaturization‚ and therefore they examined
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The Sustainability of Experience — Investing in the Human Factor 28th Annual USSD Conference Portland‚ Oregon‚ April 28 - May 2‚ 2008 Hosted by Portland General Electric On the Cover Portland General Electric’s North Fork Dam‚ on the Clackamas River southeast of Portland‚ is a thin‚ variable-radius concrete arch dam with a maximum height of 207 feet and a thickness varying from 32 feet at the base to 8 feet at the crest. The spillway is a 200-foot-long gated ogee-type structure with
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decrease the voltage (called a step down transformer). or increase the voltage (called a step up transformer‚ shown below). Alternating current is passed through the primary coil (the input) which creates a changing magnetic field in the iron core. The changing magnetic field then induces alternating current of the same frequency in the secondary coil (the output). A step up transformer has more turns of wire on the secondary coil‚ which makes a larger induced voltage in the secondary
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spacecraft travel from Earth if it is to reach the star in 4.0 years‚ as measured by travellers on the spacecraft? (b) How long does the trip take according to Earth observers? 3) Electron in a uniform magnetic field (Q54; Giancoli Chap 26) An electron ( . kg) 31 9 11 10m enters a uniform magnetic field B 1.8 T‚ and moves perpendicular to the field lines with a speed v 0.92c. What is the radius of curvature of its path? See hint for Problem 42. 4) Producing an electron and a positron (Q53;
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appliances‚ and toys in every room in your home. They are a very important and vital part of modern life. Have you ever played with magnets before? If so‚ you are well on your way to understanding how simple electric motors work. Magnets have a magnetic field with a north pole and a south pole. If you play with two magnets and try to push the north poles of each magnet together‚ the magnets will not go together. They will repel each other. The same thing happens if you try to push two south poles
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