In an ever-expanding universe, magnets are not energized or affected directly by the expansion of space. The expansion of the universe primarily affects the large-scale structure of space itself, as well as the motion of galaxies and other celestial objects. It does not directly impact the properties or behavior of individual magnets.
Magnets derive their energy and magnetic properties from the alignment and motion of their constituent particles, such as electrons and their spins. The magnetic field generated by a magnet is a result of the alignment of these particles' magnetic moments.
The behavior of magnets and their interaction with other magnets or magnetic fields is governed by the laws of electromagnetism, which are well-established and understood within the framework of physics. These laws, such as Maxwell's equations, describe how magnetic fields are produced, how they interact with electric fields, and how they influence the motion of charged particles.
The expansion of the universe, on the other hand, is a cosmological phenomenon described by the theory of general relativity. It deals with the large-scale dynamics of space itself, the distribution of matter and energy, and the overall geometry of the universe. The expansion of space does not alter the fundamental laws of electromagnetism that govern the behavior of magnets.
Therefore, in the context of an expanding universe, magnets retain their magnetic properties and behavior as dictated by the laws of electromagnetism. The expansion of space does not directly affect their energy or alter their functioning.