CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
Magnetism. Iron filings clinging to a magnet. Magnetism is a manifestation of one of the fundamental forces of physics: electromagnetism. Another of the fundamental forces is gravity. The magnetic force is generated by moving subatomic particles called electrons. All materials have magnetic properties but metals can produce particularly strong magnetic fields because their electrons flow freely, apart from atomic nuclei.
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