A manufacturer checks a draft field map for a narrow magnetic test cell. The central region between the pole faces is intended to contain a uniform magnetic field.
| Feature | Draft record |
|---|---|
| Pole faces | Upper face is north; lower face is south |
| Central region | Lines are straight, parallel and equally spaced; arrows point from the lower face to the upper face |
| Open edge | Lines curve outwards and their separation increases |
Which statement about the draft field map is correct?
The arrows must be reversed; the field near the open edge is weaker than in the central region.
The arrows are correct; the field near the open edge is stronger than in the central region.
The arrows must be reversed; the field near the open edge is stronger than in the central region.
The arrows are correct; the field near the open edge is weaker than in the central region.