The values of relative permeability of diamagnetic materials are slightly less than 1 and ${\epsilon }_{\text{r}}$ is quite high. According to the table given, one takes ${\epsilon }_{\text{r}}=\text{1.5}\text{ and }{\mathrm{ \mu }}_{\text{r}}=\text{0.5}$. The choice (${\epsilon }_{\text{r}}=\text{1.5}\text{,}{\mathrm{ \mu }}_{\text{r}}=\text{0.5}$)  is correct.