| Physical situation | Magnitude of $B$ (in tesla) |
| Surface of a neutron star | $10^{8}$ |
| Large field in a laboratory | $1$ |
| Near a small bar magnet | $10^{-2}$ |
| On the Earth's surface | $10^{-5}$ |
| Human nerve fiber | $10^{-10}$ |
| Interstellar space | $10^{-12}$ |
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