SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Magnetic repulsion. Iron filings are sprinkled over two bar magnets revealing the shape of the three-dimensional magnetic field around them. Bar magnets have a north and a south pole. Unlike poles attract each other, whereas like poles repel each other. Here, the magnetic field induces magnetism in the iron filings which repel each other between the two north poles. They form field lines arcing away from the ends of the magnets.
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