Question

Relative permittivity and permeability of a material is ${ϵ}_r$ and ${\mu }_r$, respectively. Which of the following values of these quantities are allowed for a diamagnetic material ?

• A. ${ϵ}_r=0.5,{\mu }_r=1.5$
• B. ${ϵ}_r=1.5,{\mu }_r=0.5$
• C. ${ϵ}_r=0.5,{\mu }_r=0.5$
• D. ${ϵ}_r=1.5,{\mu }_r=1.5$

Answer 1

The correct option is B ${ϵ}_r=1.5,{\mu }_r=0.5$

For a diamagnetic material, the value of relative permeability $\left({\mu }_r\right)$ is less than one i.e. ${\mu }_r<1$.

For any material, the value of ${ϵ}_r$ is always greater than or equals to $1$ i.e. $1\le {ϵ}_r$.

Only, option $\left(b\right)$ follows the conditions of a diamagnetic material.

Hence, option $\left(b\right)$ is the correct answer.