Magnetic field

Magnetic field

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Credit: CORDELIA MOLLOY/SCIENCE PHOTO LIBRARY

Caption: Magnetic field. Iron filings aligned along the magnetic field lines surrounding a bar magnet. The poles are marked north (N) and south (S). The magnetic field induces magnetism in the needle-shaped filings, giving each a north and south pole. The magnetised filings align in thin arcing lines due to the interactions between them, even though the magnetic field itself is continuous. Magnetism is a property of ferromagnetic metals (such as iron, nickel and cobalt) caused by the alignment of the spins of the electrons in the metal.

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Keywords: alignment, bar magnet, demonstration, experiment, ferromagnetic, ferromagnetism, field lines, forces, fundamental force, iron, iron filing, iron filings, line, magnet, magnetic field, magnetic pole, magnetism, north, permanent magnetism, physical, physics, poles, school science, south, still life, still-life, studio shot

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