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Magnetic Force and  Magnetic Field The force exerted by a magnet on certain materials, including other magnets, is known as a magnetic force . The force is applied across a large area and includes both attractive and repulsive forces. Two magnets with opposite north and south poles attract one another, while two magnets with comparable north and south poles repel one another. Magnets can exert force across large distances due to magnetic fields. The magnetic field surrounding a bar magnet can be seen in the image above. Under a sheet of glass, iron filings (small iron particles) were placed. The iron filings on the glass were attracted by the magnet. The magnetic field's lines of force are depicted by the pattern of iron filings. The concentration of iron filings at the poles indicates that these are the most strong areas. It's also possible to investigate how the magnetic field affects compasses above the magnet. When two magnets come close together, their magnetic fields int