The Physics of an MRI Machine. Whitney Wright PH106/006 Dr. Probst 06/05/2012 The Physics of an MRI Machine There are many physical concepts used in a Magnetic Resonance Imaging‚ also known as MRI‚ machine. There are many physical concepts used when an MRI is taken of the body‚ such as; radio waves‚ resonance and pulse sequences‚ magnetic fields being produced and lastly‚ magnets. Radio waves much stronger than the magnetic field of the Earth are sent through
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A cardboard is a moving part of the given hand made microphone. When a sound wave strikes the diaphragm (cardboard in the following experiment) of the microphone‚ the diaphragm vibrates back and forth‚ and the attached coil moves along with it. Additionally‚ magnet is attached with coils on a cardboard. When the coil alternately approaches and move back from the magnet‚ the flux through the coil changes. As a result of this‚ an ac emf is induced in the coil. Next‚ this electrical signal is sent to
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The settlement of New Kinord is a privately owned‚ and protected site situated in the Muir of Dinnet‚ Aberdeenshire. Although it has not yet been radiocarbon dated it is thought to date from the Iron Age. Aerial photography shows the presence of features that are thought to be hut circles‚ enclosures and a souterrain. During the Iron Age people lived in roundhouses in which there was a central hearth where the fire was used to cook food and provide heat and light. The fire could have been used
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SPINTRONICS: AN INTRODUCTION INTRODUCTION: From the earliest transistor to the remarkably powerful microprocessers‚ most electronic devices have employed circuits that express data as binary digits‚ or bits: ones and zeroes represented by the existence or absence of electric charge. Furthermore‚ the communication between microelectronic devices occursby the binary flow of electric charges.The technologies that emerged from this simple logic have created a multitrillion dollar per
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1. Which of the following statements about magnetic fields is not true? | Magnetic Flux is a vector. | | Changing magnetic fields create electric fields. | | Changing electric fields create magnetic fields. | | The magnetic field cannot do work on a moving charge. | | The magnetic force on a moving charge can be zero. | 2. If you double the current through an inductor‚ the energy stored in the associated magnetic field increases by a factor of _____. | Two - wrong |
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SAMPLE PAPER-03 (unsolved) PHYSICS (Theory) Class – XII Time allowed: 3 hours Maximum Marks: 70 General Instructions: a) b) c) d) e) f) g) h) All questions are compulsory. Questions 1 to 5 are one mark questions. Questions 6 to 10 are two marks questions. Questions 11 to 22 are three marks questions. Question 23 is four marks question. Question 24 to 26 are five marks questions. There is no overall choice in the question paper‚ but internal choice is there. Use of calculator is not permitted.
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Investigatory Projects in Physics Repulsorlifts as a Method of Stable Magnetic Levitation | Repulsorlifts were used in the study to find out if they can be used to replace the wheels of a conventional car. It was hypothesized that it will be able to lift a car using magnetic repulsion forces. The different magnets were tested individually with the usual tests for magnetic strength‚ size‚ and temperature increase‚ which were done in the preliminary testing. The prototype road and car were then constructed
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Making a Model Maglev Train Magnetically levitating (Maglev) trains use electromagnetic force to lift the train above the tracks. This system greatly reduces wear because there are few moving parts that carry heavy loads. It’s also more fuel efficient‚ since the energy needed to overcome friction is greatly reduced. Although maglev technology is still in its experimental stages‚ many engineers believe it will become the standard for mass transit systems over the next 100 years. This project
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9.2 Space Students learn to: Students: 1. The Earth has a gravitational field that exerts a force on objects both on it and around it define weight as the force on an object due to a gravitational field perform an investigation and gather information to determine a value for acceleration due to gravity using pendulum motion or computer-assisted technology and identify reason for possible variations from the value 9.8 ms-2 gather secondary information to predict the value of acceleration
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GUIDE QUESTIONS 1. What happens to the distribution of magnetic flux lines when the iron ring was placed in between the U-magnets? The distribution of magnetic flux lines when the iron ring is placed in between the magnets‚ the iron ring is included in the distribution of flux lines. Instead of connecting to the other pole‚ the ring affects its distribution and some of it is attracted to the iron ring. 2. How does changing the current affect the magnetic force on a wire suspended in a magnetic
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