Magnetic field
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Magnetic field is the area around a magnet in which a magnetic force is exerted. Moving electric charges produce magnetic fields. Magnetic fields are usually shown by magnetic flux lines. At all times the direction of the magnetic field is predicted by the direction of the magnetic flux lines. The strength of a magnet has to do with the spaces between magnetic flux lines. The closer the flux lines the stronger the magnet and further they are the weaker. You can see these flux lines by placing iron filings over a magnet. Magnetic fields power other particles that come in contact with the magnetic field.
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