The absolute permeability of a substance is less than that of free space. What can we say about it?
Answer & explanation
Correct answer: option 1
The absolute permeability of substance is less than that of free space. This means that the substance has to be none other than a diamagnetic material.
- Sodium is paramagnetic. 0 < Xpara < ε and -1 <= Xdia < 0. Thus, susceptibility of substance is less than sodium. ε is a small positive value.
- The substance is NOT ferromagnetic.
- Lodestone is ferromagnetic.