| 单词 | permanent magnet |
| 释义 | > as lemmaspermanent magnet permanent magnet n. a magnet which retains its magnetic properties in the absence of an inducing electric field or current. ΘΚΠ the world > matter > physics > electromagnetic radiation > magnetism > magnetic devices or materials > [noun] > a magnet > permanent magnet permanent magnet1782 1782 B. Franklin Let. 22 Sept. in Writings (1987) 1058 The globe being now become a permanent magnet, we are perhaps safe from any future change of its axis. 1828 F. Watkins Pop. Sketch Electro-magn. 12 If a steel needle be inserted in a coil and removed again immediately, it will become a permanent magnet. 1996 Nature 25 Apr. 79/1 Earnshaw's theorem..states that an object cannot be stably suspended in space by permanent magnets alone. < as lemmas |
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