Artificial Magnets
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-300
2025-11-26
38
Demonstration. -Select a sewing needle that has no attraction for iron. Rub it gently from the middle toward the point across one end of a natural magnet (a bar magnet will serve as well); then rub the other half across the other end of the magnet. Hold one end of the needle near some iron filings. They will be found to cling to the needle.
A piece of iron or steel that has the property of attracting iron as in the above demonstration is called an artificial magnet. This name is not very appropriate, and is used simply to distinguish magnets composed of manufactured iron or steel from natural magnets.
Artificial magnets are made in various forms. A bar magnet is a straight bar; a horseshoe magnet is a bar bent into U shape.
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