Question

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

• A. ${\in }_r=1.2,{\mu }_r=1.4$
• B. ${\in }_r=1.2,{\mu }_r=0.5$
• C. ${\in }_r=0.2,{\mu }_r=0.2$
• D. ${\in }_r=0.4,{\mu }_r=1.4$

Answer 1

The correct option is B ${\in }_r=1.2,{\mu }_r=0.5$

For diamagnetic materials
${\in }_r>1$ and ${\mu }_r<1$
and from options we can say only option (b) has it.