In ancient times, naturally occurring magnets were called lodestones. These magnetic rocks, primarily composed of magnetite, were among the first materials used to study and understand magnetic properties and were crucial in early navigation.
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No, all parts of a magnet do not attract magnetic materials equally. The poles, where the magnetic field is strongest, attract materials more effectively, while the areas between the poles have weaker magnetic attraction.
No, iron filings do not stick uniformly across the entire surface of a magnet. They accumulate more densely at the poles, where the magnetic field is strongest, creating a visible pattern of attraction.
In a speaker, the magnet generates a stable magnetic field that interacts with an electric current in the coil. This interaction causes the coil to move, driving the speaker cone and producing sound waves.
To make a magnetic compass, magnetize a needle by rubbing it with a magnet, then float the needle on a small piece of cork or paper in water. It will align itself with Earth’s magnetic field.