It introduces that how to watch and measure the hysteresis loop-line, residual magnet and coercive force of ferromagnet through an oscillograph.
介绍了如何利用示波器观察和测量铁磁物质的磁滞回线、剩余磁感应强度和矫顽力。
Place any magnet under the unit and set it on an overhead projector-and you will see the filings moving to line up along the lines of magnetic force.
将一磁铁放在盒下并将它放在一投影机下面——你即可看到铁粉随著磁力线的分布而移动。
The rotation will last for ever if the permanent magnetic ring and the magnetic force line of the permanent magnet SN exist for ever.
只要永磁环和永磁体sn的磁力线永久存在，旋转也将始终存在。
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