ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Magnetic field. Coloured computer graphic of a horseshoe magnet (orange) with iron filings aligned around it. The magnetic field induces magnetism in each of the filings (pink), which then line up in the field. Although the field is actually continous, interactions between the filings cause them to accumulate in thin arcing lines.
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