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"In fact, what you said was wrong just now. Not only iron, but also cobalt and nickel that can be attracted by magnets."
"What they have in common is that they can be magnetized, and under the influence of an external magnetic field, the electron spins inside them can spontaneously align in a small area to form a spontaneously magnetized region...that is, it is temporarily magnetized, Turned into a magnet!
In most substances, electrons move in different directions a ...
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