Discussion
Which of the following has the highest permeability ?
Answer: C
The highest permeability belongs to ferromagnetic material.
Ferromagnetic materials such as iron, nickel and cobalt have relative permeabilities from hundreds to many thousands, because their magnetic domains line up strongly with an applied field.
Vacuum has a relative permeability of exactly 1 by definition. Paramagnetic materials are only slightly above 1 and diamagnetic materials slightly below 1, so none of them comes close.
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