nothing!!
2007-05-04 23:16:38 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Means it is a permanent magnet
2007-05-04 23:21:29 · answer #1 · answered by Sal D 1 · 0⤊ 1⤋
The magnetic domains in steel are stable and hard to change. You need to do a lot of work to make them switch orientation. But once you switch them, they tend to stay that way. If you want a permanent magnet, that's good. But if you want to change the magnetization frequently, as you would in an electromagnet or a transformer, you prefer iron. It is still ferromagnetic, but its domains are much more easily switched. A transformer with a steel core would be less efficient and would heat up a lot more.
2007-05-05 05:06:45 · answer #2 · answered by Frank N 7 · 0⤊ 0⤋
Magnetically hard = capable of being magnetized permanently because of its ability to retain induced magnetization and magnetic poles after removal of externally applied fields; an alloy with high coercive force. The name is based on the fact that the quality of the early permanent magnets was related to their hardness.
2007-05-04 23:48:37 · answer #3 · answered by Govinda 3 · 0⤊ 0⤋
To put it simply, it means that if you magnetize it it tends to stay magnetized. Just what you want for a permanent magnet, but not very good for an electromagnet that you want to switch off!
2007-05-04 23:41:03 · answer #4 · answered by lunchtime_browser 7 · 0⤊ 0⤋