| 1. | Total field measurement is not always desirable .
总磁场测量不是始终需要的。 |
| 2. | A fluctuating magnetic field is produced in the iron .
铁心中就产生交变磁场。 |
| 3. | In small fields the changes are reversible .
在很弱的磁场中，这种改变是可逆的。 |
| 4. | The string is in a magnetic field .
振动弦处于磁场之中。 |
| 5. | The strength of the magnetic fields are likewise fixed .
磁场的大小也同样是固定的。 |
| 6. | We might put the current-carrying wire in a magnetic field .
我们可将载流导线置于磁场中。 |
| 7. | A third radiation group was unaffected by the magnetic field .
第三组射线不受磁场的影响。 |
| 8. | The iron flings align themselves in the direction of the magnetic field
铁屑按磁场的方向排列。 |
| 9. | If a magnetic field is switched on, the symmetry is broken .
如果加上磁场，就破坏了这种对称性。 |
| 10. | The magnetic field of an atom is usually dominated by the electrons .
原子的磁场通常由电子决定。 |
