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Temporary: How Can You Make a Magnet by Induction? (page 2)

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Author: Janice VanCleave

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  1. Another example of induced magnetism can be demonstrated by tying a small paper clip to a 12-inch (30-cm) piece of thread. Stack several books on a table. Place a bar magnet so that its end extends over the edge of the top book. Place the paper clip under the end of the magnet, and slowly pull down on the string until the clip is suspended in the air. Tape the end of the string to the table, leaving the clip so that it appears to be floating in the air below the magnet. This model can be used as part of a project display.
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  3. Does the induced magnetic material retain any of its magnetic power? Touch an iron nail to a paper clip to test its lack of magnetic properties. Then hold a strong magnet near but not touching the nail. After three minutes, remove the magnet and touch the nail to the paper clip again. Diagrams showing the steps of this experiment can be included as part of a project display.
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  5. Design experiments to determine the answers to these questions about induced magnetism:
    • Does the length of time the material remains near the magnet affect its magnetic powers?
    • How does the shape of the material in which magnetism is being induced affect the results?

Check It Out!

Magnetic Resonance Images (MRI) are used to examine the soft, watery tissues of the human body, such as in the brain, gums, and internal organs. Your dentist or physician can help you to find out more about this magnetic testing, which has a magnetic field 30,000 times as strong as the earth's magnetic field. How important is the presence of water in the tissue being examined? What role does magnetic induction play in the forming of the magnetic images?

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