磁场性质演示实验中，常用铁屑在磁场中被磁化的性质来显示磁感线的形状。通常做法是在磁铁上面放一块玻璃板，再在玻璃板上均匀地撒一层细铁屑，细铁屑在磁场里被磁化成“小磁针”。轻敲玻璃板，使铁屑能在磁场作用下转动，铁屑静止时，有规则地排列起来，显示磁感线的形状。 In the demonstration of magnetic field properties, the shape of magnetic lines of inductance is often shown by the nature of magnetization of iron filings in a magnetic field. The usual practice is to put a glass plate on top of the magnet, and then evenly spread a thin layer of iron scraps on the glass plate. Fine iron chips are magnetized in the magnetic field into a “small needle”. Lightly tap the glass plate so that the iron chips can rotate under the action of the magnetic field. When the iron chips are at rest, they are arranged regularly and show the shape of the magnetic induction line.