Recall how a magnetic field acts. In a 2D space around a magnetIn a 3D space around a magnetI'm not sure

A magnetic field is a region around a magnetic material or a moving electric charge within which the force of magnetism acts.

In a 2D space around a magnet, the magnetic field can be represented by lines of force, or magnetic field lines. These lines start from the north pole of the magnet and end at the south pole. The density of the lines indicates the magnitude of the magnetic field. If the lines are close together, the magnetic field is strong; if they are far apart, the magnetic field is weak.

In a 3D space around a magnet, the magnetic field is more complex. It forms a three-dimensional pattern around the magnet. The field still starts at the north pole and ends at the south pole, but it forms a continuous loop, extending out into space. The strength of the magnetic field still depends on the density of the field lines.

If you're not sure about the concept of a magnetic field, it might be helpful to think of it like the field around a bar magnet. If you've ever played with a bar magnet and iron filings, you've seen a magnetic field. The iron filings line up along the field lines, showing the shape of the field in two dimensions. In three dimensions, the field would extend out from the magnet in all directions, forming a 3D pattern.