A magnetic field can be visualized using iron filings or a compass. Iron filings sprinkled around a magnet align along the field lines, while a compass needle aligns itself with the magnetic field direction.
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A magnetic field is an invisible force field around a magnet where magnetic forces are exerted. It is represented by field lines that emerge from the north pole and enter the south pole of the magnet.
Magnets attract or repel each other based on their poles. Opposite poles (north and south) attract, while like poles (north-north or south-south) repel. This behavior is due to the interaction of their magnetic fields.
Magnets are classified into three main types: permanent magnets, temporary magnets, and electromagnets. Permanent magnets retain their magnetism, temporary magnets lose it quickly, and electromagnets are magnetic only when an electric current flows.