How Magnets Work
Magnets work because of the alignment of tiny magnetic fields created by electrons spinning inside atoms, which produces a magnetic force that can attract or repel certain materials.
It's often said that a compass points toward a giant magnetic north pole at the top of the map — in fact, its north-seeking end is attracted toward a magnetic-south region near Earth's geographic North.
Understanding magnets helps us with many technologies like electric motors, generators, and data storage, making magnets essential in everyday devices and industrial machines.
Imagine lots of tiny spinning tops inside a magnet all pointing the same way, and that makes the magnet pull things like iron towards it, kind of like an invisible hand.
Magnets sit inside many of the tools that turn electricity into motion and motion back into electricity, from speakers to motors. Knowing what they can and cannot attract also helps make sense of recycling, repairs, and everyday gadgets.
In a simple speaker, changing electric current flows through a coil attached to the speaker cone. The coil's changing magnetic field interacts with a nearby permanent magnet, making the coil move back and forth. The cone pushes the air in the same pattern, producing sound.
Magnetic poles come in pairs
Every magnet has a north-seeking end and a south-seeking end, so opposite ends pull together while matching ends push apart.
Only some materials respond strongly
Iron, nickel, cobalt, and some alloys can be strongly affected by magnets because their tiny magnetic fields can line up more easily.
Magnetic strength can fade
Heat, hard knocks, or a strong magnetic field pointing the other way can scramble the alignment inside some magnets and make them weaker.