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tape, particles are magnetized in a pattern that follows the input waveform. Graph A shows an example of an audio input waveform. Graph B shows relative polarity and intensity of magnetization for selected particles on the tape surface.
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Magnetic Disk Since the advent of the personal computer, ever-more compact data-storage systems have evolved. One of the most versatile is the magnetic disk. Hard disks, also called hard drives, store the most data, and are generally found inside of computer units. Diskettes are 8.9 cm (3.5 in) across, and can be inserted and removed from recording/playback machines called diskette drives. In recent years, magnetic diskettes have been largely supplanted by nonmagnetic compact disc recordable (CD-R) and compact disc rewritable (CD-RW) media. The principle of the magnetic disk, on the microscale, is the same as that of magnetic tape. The information is stored in binary digital form; that is, there are only two different ways that the particles are magnetized. This results in almost perfect, error-free storage. On a larger scale, the disk works differently than the tape 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 as measured along the medium itself. But on a disk, no two bits are ever farther apart than the diameter of the disk. This means that data can be stored to, and retrieved from, a disk much faster than is possible with tape. The same precautions should be observed when handling and storing magnetic disks as are necessary with magnetic tape. Bubble Memory 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. Data is stored as tiny magnetic fields, in a medium that is made from magnetic film and semiconductor materials. 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. Bubble memory seems to go through phases. Just as it is declared obsolete, someone comes up with a new and improved way to make it work. Check the Internet to find out its current status; enter bubble memory or magnetic bubble memory into a search engine.
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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) makes a compass work. (d) makes an electromagnet work. 2. Geomagnetic lines of flux (a) are horizontal at the geomagnetic equator. (b) are vertical at the geomagnetic equator.
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(c) are never horizontal, no matter where you go. (d) are perfectly symmetrical around the earth, even far out in space. 3. A material that can be permanently magnetized is generally said to be (a) ultramagnetic. (b) electromagnetic. (c) diamagnetic. (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. The presence of a magnetic field can always be attributed to (a) ferromagnetic materials. (b) diamagnetic materials. (c) motion of electric charge carriers. (d) the north geomagnetic pole. 6. Lines of magnetic flux are said to originate (a) in atoms of ferromagnetic materials. (b) at a north magnetic pole. (c) at points where the lines are straight. (d) in electric 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. 9. A unit of overall magnetic field quantity is the (a) maxwell. (b) gauss. (c) tesla. (d) ampere-turn.
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