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148 Magnetism
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8-10 On recording tape, particles are magnetized in a pattern that follows the modulating waveform.
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On a larger scale, the disk works differently than the tape, simply because of the difference in geometry. On a tape, the information is spread out over a long span, and some bits of data are far away from others. But on a disk, no two bits are ever farther apart than the diameter of the disk. This means that data can be stored and retrieved much more quickly onto, or from, a disk than is possible with a tape. A typical diskette can store an amount of digital information equivalent to a short novel. The same precautions should be observed when handling and storing magnetic disks, as are necessary with magnetic tape.
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Magnetic bubble memory
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Bubble memory is a sophisticated method of storing data that gets rid of the need for moving parts such as are required in tape machines and disk drives. This type of memory is used in large computer systems, because it allows the storage, retrieval, and transfer of great quantities of data. The bits of data are stored as tiny magnetic fields, in a medium that is made from magnetic film and semiconductor materials.
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Quiz 149 A full description of the way bubble memory systems are made, and the way they work, is too advanced for this book. Bubble memory makes use of all the advantages of magnetic data storage, as well as the favorable aspects of electronic data storage. Advantages of electronic memory include rapid storage and recovery, and high density (a lot of data can be put in a tiny volume of space). Advantages of magnetic memory include nonvolatility (it can be stored for a long time without needing a constant current source), high density and comparatively low cost.
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Refer to the text in this chapter if necessary. A good score is at least 18 correct. Answers are in the back of the book. 1. The geomagnetic field: A. Makes the earth like a huge horseshoe magnet. B. Runs exactly through the geographic poles. C. Is what makes a compass work. D. Is what makes an electromagnet work. 2. Geomagnetic lines of flux: A. Are horizontal at the geomagnetic equator. B. Are vertical at the geomagnetic equator. C. Are always slanted, no matter where you go. D. Are exactly symmetrical around the earth, even far out into space. 3. A material that can be permanently magnetized is generally said to be: A. Magnetic. B. Electromagnetic. C. Permanently magnetic. D. Ferromagnetic. 4. The force between a magnet and a piece of ferromagnetic metal that has not been magnetized: A. Can be either repulsive or attractive. B. Is never repulsive. C. Gets smaller as the magnet gets closer to the metal. D. Depends on the geomagnetic field. 5. Magnetic flux can always be attributed to: A. Ferromagnetic materials. B. Aligned atoms. C. Motion of charged particles. D. The geomagnetic field.
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150 Magnetism 6. Lines of magnetic flux are said to originate: A. In atoms of ferromagnetic materials. B. At a north magnetic pole. C. Where the lines converge to a point. D. In charge carriers. 7. The magnetic flux around a straight, current-carrying wire: A. Gets stronger with increasing distance from the wire. B. Is strongest near the wire. C. Does not vary in strength with distance from the wire. D. Consists of straight lines parallel to the wire. 8. The gauss is a unit of: A. Overall magnetic field strength. B. Ampere-turns. C. Magnetic flux density. D. Magnetic power.
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9. A unit of overall magnetic field quantity is the: A. Maxwell. B. Gauss. C. Tesla. D. Ampere-turn.
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10. If a wire coil has 10 turns and carries 500 mA of current, what is the magnetomotive force in ampere-turns A. 5000. B. 50. C. 5.0. D. 0.02. 11. If a wire coil has 100 turns and carries 1.30 A of current, what is the magnetomotive force in gilberts A. 130. B. 76.9. C. 164. D. 61.0. 12. Which of the following is not generally possible in a geomagnetic storm A. Charged particles streaming out from the sun. B. Fluctuations in the earth s magnetic field. C. Disruption of electrical power transmission.
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