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Table 8-1.
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Permeability values for some common materials.
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Permeability (approx.) 1 3000 1,000,000 Slightly more than 1 Slightly less than 1 60 70 100 3000 3000 8000 60 100 50 60 Slightly less than 1 300 600 1 Slightly less than 1 Slightly less than 1
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Substance Air, dry, at sea level Alloys, ferromagnetic Aluminum Bismuth Cobalt Iron, powdered and pressed Iron, solid, refined Iron, solid, unrefined Nickel Silver Steel Vacuum Wax Wood, dry
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when the current stops flowing in the coil. Retentivity, also sometimes called remanence, is a measure of how well the substance memorizes the magnetism and thereby becomes a permanent magnet. Retentivity is expressed as a percentage, and is symbolized Br. If the flux density in the material is x tesla or gauss when it is subjected to the greatest possible magnetomotive force, and then goes down to y tesla or gauss when the current is removed, the retentivity is equal to 100( y/x)%. Suppose that a metal rod can be magnetized to 135 G when it is enclosed by a coil carrying an electric current. Imagine that this is the maximum possible flux density that the rod can be forced to have. (For any substance, there is always such a maximum.) Now suppose that the current is shut off, and 19 G remain in the rod. Then the retentivity, Br, is calculated as follows: Br = 100(19/135)% = (100 0.14)% = 14% Some ferromagnetic substances have high retentivity. These materials are excellent for making permanent magnets. Other substances have low retentivity. They work well as electromagnets, but not as permanent magnets. If a ferromagnetic substance has poor retentivity, it is especially well-suited for use as the core material for an ac electromagnet, because the polarity of the magnetic flux can reverse within the material at a rapid rate. Materials with high retentivity do not work well for ac electromagnets, because they resist the polarity reversal that takes place with ac.
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Magnetism has numerous applications in common consumer devices and systems. Here are some of the more common ways in which magnetic phenomena can be put to use.
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Permanent Magnets Permanent magnets are manufactured by using a high-retentivity ferromagnetic material as the core of an electromagnet for an extended period of time. The coil of the electromagnet carries a large direct current, causing intense magnetic flux of constant polarity within the material. (Don t try to do this at home. The high current can heat the coil and overload a battery or power supply, which produces a fire hazard and/or the risk of battery explosion.) If you want to magnetize a screwdriver a little bit so that it will hold onto screws, just stroke the shaft of the screwdriver with the end of a bar magnet several dozen times. Once you have magnetized a tool in this way, however, it is nearly impossible to demagnetize it. A Ringer Device Figure 8-7 is a simplified diagram of a bell ringer, also called a chime. The main functional component is called a solenoid, and it is an electromagnet. The core has a hole going along its axis. The coil has several layers, but the wire is always wound in the same direction, so that the electromagnet is powerful. A movable steel rod runs through the hole in the electromagnet core. When there is no current flowing in the coil, the steel rod is held down by the force of gravity. When a pulse of current passes through the coil, the rod is pulled forcibly upward so that it strikes the ringer plate. This plate is like one of the plates in a xylophone. The current pulse is short, so the steel rod falls back down again to its resting position, allowing the plate to reverberate.
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