What property determines whether a material can be easily magnetized?

The ability of a material to be easily magnetized is primarily determined by its permeability. Permeability is a measure of how well a material can support the formation of a magnetic field within itself. Materials with high permeability can become magnetized more easily because they allow magnetic field lines to pass through them with less resistance. This property is critical in applications like transformers and inductors, where the efficient transfer of magnetic flux is essential.

In contrast, materials with low permeability do not support magnetic fields efficiently, making them harder to magnetize. While conductivity, resistivity, and ductility are important properties in their own contexts, they do not directly influence a material's ability to become magnetized. Conductivity relates to how well a material can conduct electric current, resistivity measures how strongly a material opposes current flow, and ductility describes how much a material can be deformed without breaking. None of these properties determine the ease with which a material can be magnetized.