Question

If the relative permittivity and permeability of a given material are $\epsilon _{\text{r}}$ and $\mu _{\text{r}}$ , respectively then, which among the following is correct for a diamagnetic material?

• A. $\epsilon _{\text{r}} = \text{1.5} \text{,} \, μ_{\text{r}} = \text{1.5}$
• B. $\epsilon _{\text{r}} = \text{0.5} \text{,} \, μ_{\text{r}} = \text{1.5}$
• C. $\epsilon _{\text{r}} = \text{1.5} \text{,} \, μ_{\text{r}} = \text{0.5}$
• D. $\epsilon _{\text{r}} = \text{0.5} \text{,} \, μ_{\text{r}} = \text{0.5}$

Answer 1

Answer: (C)

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 $\epsilon _{\text{r}} = \text{1.5} \text{ and } \, μ_{\text{r}} = \text{0.5}$ . The choice ( $\epsilon _{\text{r}} = \text{1.5} \text{,} \, μ_{\text{r}} = \text{0.5}$ ) is correct.