What defines a magnetic field?

A magnetic field is defined as the zone around a magnet where magnetic forces can be observed and act on other magnets or magnetic materials. This field is generated by moving electric charges, such as those found in electric currents, or by the intrinsic magnetic properties of materials. The magnetic field is represented visually by field lines that show the direction and strength of the magnetic force.

In this context, the first option describes a conductive area but does not encompass the true nature of a magnetic field. The third option refers to light energy, which is unrelated to magnetic forces. The fourth option incorrectly suggests that a magnetic field restricts interactions; rather, it facilitates them. The correct choice emphasizes the observable effects of the magnetic field and its ability to influence other magnetic objects within its domain.