The basic EFPA uses a voltage source and a combination of circuitry to accelerate an object to a desired speed. This is what makes EFPA a fairly unique device. An Electromotive Force Projectile Accelerator demonstrates many of basic concepts of magnetic machines. An EFPA is an example of an electromagnetic coil/solenoid. Such appear practically everywhere‚ from car door locks to doorbells and from diskette drive ejectors to fuel injectors. The only difference is that most solenoids limit the range
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Ibrahim Shahl 3 AC winding design The windings used in rotating electrical machines can be classified as Concentrated Windings • All the winding turns are wound together in series to form one multi-turn coil • All the turns have the same magnetic axis • Examples of concentrated winding are – field windings for salient-pole synchronous machines – D.C. machines – Primary and secondary windings of a transformer Distributed Windings • All the winding turns are
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deals with the magnetic field induction at a point due to a small current element. Current element A current element is a conductor carrying current.It is the product of current‚I and length of very small segment of current carrying wire ‚dL. Let us consider a small element AB of length dl of the conductor RS carrying a current I. Let r be the position vector of the point P from the current element I dL.and θ be the angle dl and r. According to Biot-Savart’s law‚the magnetic field induction
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Magnets. How do they work? How does the number of coils affect electromagnetism? Hypothesis: When there is a flow of moving electrons‚ a magnetic field is created. We use the equation F = NIlB (Force = Number of coils x Current x Length of Wire x Magnetic Field Strength) to work out the magnetic force produced in a wire when there is an electric current present. Using this equation we can see that increasing the length of the wire (amount of coils) gives a larger force. So increasing the amount
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Switzerland in 1937 A modern cyclotron for radiation therapy A cyclotron is a type of particle accelerator in which charged particles accelerate outwards from the center along a spiral path. The particles are held to a spiral trajectory by a static magnetic field and accelerated by a rapidly varying (radio frequency) electric field. History[edit] The cyclotron was invented and patented[1] by Ernest Lawrence of the University of California‚ Berkeley‚ where it was first operated in 1932.[2] A graduate
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I assumed that slung peace would come out first because it is a nonmagnetic material‚ which will not create any magnetic induction‚ and magnetic forced will not act; it neither oppose nor support slung motion through the metal tube. However‚ a piece of the magnet crates magnetic force with the metal tube. Falling of the magnetic piece creates magnetic force‚ which oppose the magnetic piece’s motion‚ causing it fall slowly through the metal tubes. In the following experiment‚ a single magnet (60g)
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the actual discovery was an accident‚ Oersted was on the right track. He had all the right materials and the right general idea. One afternoon Hans Christian Oersted was attempting to demonstrate to his students that moving charges did not make a magnetic field. Oersted had planned to demonstrate this by showing the heating of a wire by an electric current. He also wanted to demonstrate magnetism. In order to do this‚ he provided a compass needle mounted on a wooden stand. Oersted noticed that every
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Working When a current carrying conductor is placed in a magnetic field‚ it experiences a force and tends to move in the direction as per Fleming’s left hand rule. Fleming left hand rule: If the first and the second finger and the thumb of the left hand are held so that they are at right angle to each other‚ then the thumb shows the direction of the force on the conductor‚ the first finger points towards the direction of the magnetic field and the second finger shows the direction of the current
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1 hour IB DIPLOMA PROGRAMME PROGRAMME DU DIPLÔME DU BI PROGRAMA DEL DIPLOMA DEL BI N07/4/PHYSI/HPM/ENG/TZ0/XX+ 88076501 Physics higher level PaPer 1 Thursday 8 November 2007 (afternoon) INSTRUCTIONS TO CANDIDATES • Do not open this examination paper until instructed to do so. • Answer all the questions. • For each question‚ choose the answer you consider to be the best and indicate your choice on the answer sheet provided. 8807-6501 21 pages © IBO 2007 –2– 1. Which
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couplings of which‚ however‚ are still under discussion. Here we present results of the longitudinal elastic constant c22 down to 80 mK and magnetic fields up to 12 T. c22 reveals clear signatures of the magnetic energy scales involved and discloses distinct anomalies at the Néel ordering TN = 1.88 K. Based on measurement as a function of temperature and magnetic field‚ a detailed B-T phase diagram is mapped out which includes an additional phase boundary of unknown origin at low temperature (T < 0
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