A convenient method to describe the magnetic field around a magnet is to draw magnetic field lines around it. In order to do so, place a magnet on a cardboard sheet and gently sprinkle some iron filings uniformly over it. The iron filings are found to arrange themselves in a pattern. The curved paths along which the iron filings arrange themselves due to the force acting on them in the magnetic field of the bar magnet are called magnetic field lines
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When iron filings are sprinkled around a magnet, an image of the magnetic field is captured. ... Furthermore, these iron filings separate into clearly visible patterns of lines.
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