Which materials conduct magnetic lines of force very well?

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The ability to guide magnetic flux depends on magnetic permeability. Ferromagnetic materials have very high permeability because their magnetic domains align in a field, producing a strong net magnetization. This creates a low-reluctance path for the magnetic lines of force, so the flux flows through the material easily and concentrates there. That’s why ferromagnetic substances like iron, nickel, and cobalt conduct magnetic lines of force very well and are used for cores and magnets.

Di­amagnetic materials weakly repel magnetic fields and provide only a tiny, negative response, so they don’t guide flux well. Paramagnetic materials are weakly attracted to magnetic fields but also don’t offer a high-permeability path. “Conductive” describes electrical conduction, not how well a material channels magnetic lines of force, so it’s not relevant to this property.