Q123 / 180 · COMEDK 2023 (Evening Shift) · Physics
The magnetic permeability '$\mu$' a of a paramagnetic substance is :
- A$\mu=1$
- B$\mu=0$
- Correct answerC$\mu>1$
- D$\mu$ is infinite
Solution
The magnetic permeability $\mu$ of a material is related to its relative permeability $\mu_{r}$ by the relation $\mu = \mu_{0} \mu_{r}$.
For a paramagnetic substance, the magnetic susceptibility $\chi$ is small and positive. The relative permeability is given by $\mu_{r} = 1 + \chi$.
Since $\chi > 0$ for paramagnetic materials, it follows that $\mu_{r} > 1$.
Consequently, the absolute magnetic permeability $\mu = \mu_{0} \mu_{r}$ is greater than the permeability of free space $\mu_{0}$. In the context of relative permeability or dimensionless permeability often used in such questions, $\mu > 1$.
Answer: $\mu>1$
For a paramagnetic substance, the magnetic susceptibility $\chi$ is small and positive. The relative permeability is given by $\mu_{r} = 1 + \chi$.
Since $\chi > 0$ for paramagnetic materials, it follows that $\mu_{r} > 1$.
Consequently, the absolute magnetic permeability $\mu = \mu_{0} \mu_{r}$ is greater than the permeability of free space $\mu_{0}$. In the context of relative permeability or dimensionless permeability often used in such questions, $\mu > 1$.
Answer: $\mu>1$
Hence, the correct answer is option: 'C'.