Mondo Magnets: 40 Attractive (and Repulsive) Devices and Demonstrations

Mondo Magnets: 40 Attractive (and Repulsive) Devices and Demonstrations

Fred Jeffers

Language: English

Pages: 160

ISBN: 155652630X

Format: PDF / Kindle (mobi) / ePub


Surprising and seemingly impossible effects result from the 40 experiments included in this fascinating science resource—all based on real magnetic physics. Each experiment—such as using a common refrigerator magnet to create a three-dimensional image or floating a magnet and carbon sheet in midair—is outlined with step-by-step instructions and diagrams that illustrate the key concepts of magnetism. Even the most experienced science teacher or at-home tinkerer will find dozens of new tricks in this amazing collection.

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identical loop of metallic iron powder. M-H loops of Total® cereal and iron powder The obvious conclusion from this plot is that Total® fortified cereal is “fortified” with iron that has been added in the form of metallic iron powder. It remains to be seen if metallic iron is digested and absorbed by the body. The beach sand and dirt both contain varying amounts of Fe3O4. The rock, sand, and dirt all have M-H loops very similar to that of the $1 bill, because all three contain small particles

transformer (available at most hobby stores) Large-scale magnetic recording head Thin sheet of plastic magnetic field viewer material (available from Star Micronics at www.starmicronics.com and from Teacher Source at www.teachersource.com/catalog/page/Electricity_Magnetism_Engines/Magnet_Products/) Rubber refrigerator magnet Magnetic recording head and model train transformer The author has worked in magnetic recording research for nearly 38 years, so a demonstration that illustrates

drift. About the Author Fred Jeffers received his BS in physics from Michigan State University and his MS and PhD in physics from New Mexico State University. He began working in magnetic product research and development at the Bell and Howell Research Center in Pasadena, California, in 1967, and was there for seven years. He then moved to Spin Physics/Kodak (later a division of the Kodak Research Laboratory) in San Diego, California, where he worked in magnetic recording research for 24 years.

magnet, at that 9-cm distance, is so small. When the container is shaken, adjacent particles are at first repelled by one another, but are then attracted to each other in a head-to-tail arrangement. As the shaking continues, these head-to-tail pairs merge to form chains, and the chains merge to form the “mountains” that reach up toward the magnet. Each particle is supported in part by the particle below it, and in part by the upward force of the magnet. At some point the peak of one mountain

magnet. Unlike the 4-cm nail, it will not stand up straight at that distance from the magnet, as is shown in the photo below. The nail that will not stand up The Science Behind It Why does one nail stand up straight, while the other one won’t? A clue is that the nail that stands up is a little shorter than the one that won’t. A long, thin, magnetic body, such as a nail, tends to rotate to be parallel to the average field over its length. The field of a magnet is rather complicated. It’s

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