Magnets can be demagnetized by heating or shock, the horseshoe shape increases magnet strength, experiments can visualize magnetic fields, electromagnets differ from permanent magnets, and storing magnets properly prevents demagnetization.
Magnetism: A magnet exhibits attractive and repulsive forces due to its magnetic field. Magnetic materials are substances that can be magnetized, while magnetic fields are regions surrounding a magnet where its influence is felt.
Demagnetization of a Magnet: A magnet can be demagnetized by heating it beyond its Curie temperature or subjecting it to mechanical shock, disrupting its aligned magnetic domains.
Horseshoe Magnet Advantage: The horseshoe shape of a magnet increases its magnetic strength as the poles are closer together, concentrating the magnetic field.
Experimental Magnetism: To visualize a magnetic field, place a bar magnet underneath a paper and sprinkle iron filings. The filings align along the field lines, showing the field's shape.
Electromagnets vs. Permanent Magnets: Electromagnets use an electric current to generate a magnetic field and can be turned on and off, unlike permanent magnets which retain their magnetism.
Magnet Loss and Storage: Magnets can lose their magnetism due to high temperatures or physical shock. To prevent gradual loss, store them away from other magnets and heat sources.
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