A magnet that retains its magnetic properties in the absence of an inducing field or current.
- ‘The molecules were maintained under tension by the field gradient of two small permanent magnets placed above the sample.’
- ‘If this condition persists even in the absence of an external magnetic field, the material is a permanent magnet.’
- ‘He did it by using only the energy contained in the atoms of permanent magnets, he said.’
- ‘A permanent magnet may be represented precisely by an appropriate density of hypothetical magnetic charges on its two pole faces.’
- ‘The magnetic ring includes a ring and a pair of permanent magnets that extend from the ring.’
We take a look at several popular, though confusing, punctuation marks.