JEE MAIN - Physics (2008 - No. 9)
Relative permittivity and permeability of a material $${\varepsilon _r}$$ and $${\mu _r},$$ respectively. Which of the following values of these quantities are allowed for a diamagnetic material?
$${\varepsilon _r} = 0.5,\,\,{\mu _r} = 1.5$$
$${\varepsilon _r} = 1.5,\,\,{\mu _r} = 0.5$$
$${\varepsilon _r} = 0.5,\,\,{\mu _r} = 0.5$$
$${\varepsilon _r} = 1.5,\,\,{\mu _r} = 1.5$$
解释
For a diamagnetic material, the value of $${\mu _r}$$ is less than one. For any material, the value of $${ \in _r}$$ is always greater than $$1.$$