本题目来源于试卷: Magnetism Magnetism，类别为 IB物理学
[问答题]
Will a magnet attract any metallic object, or onlys-fm1o*j6fys dnjn,dgr /r.* those made of iron? (T,wk(a* r zgvwnho :1f+ev(, ofry it and sevg ofanov(:k +ze1, ,*w hwr(fe.) Why is this so?
参考答案:
A
magnet will not attract just any metallic object. For example, while a magnet will attract
paper clips and nails, it will not attract coins or pieces of aluminum
foil. This is because magnets will only
attract other ferromagnetic materials (iron, cobalt, nickel, gadolinium, and
some of their oxides and alloys). Iron
and its alloys are the only common materials.
These ferromagnetic materials contain magnetic domains that can be made
to temporarily align when a strong magnet is brought near. The alignment occurs in such a way that the
north pole of the domain points toward the south pole of the strong magnet, and
vice versa, which creates the attraction.
本题详细解析:
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