Question

The susceptibility of a paramagnetic material is $99$. The permeability of the material in $\text{Wb/A-m}$ is
[Permeability of free space ${\mu }_0=4\pi \times {10}^{-7}\text{Wb/A-m}$]

• A. $4\pi \times {10}^{-7}$
• B. $4\pi \times {10}^{-6}$
• C. $4\pi \times {10}^{-5}$
• D. $4\pi \times {10}^{-4}$

Answer 1

The correct option is C $4\pi \times {10}^{-5}$

${\mu }_r=\chi +1$
$=99+1=100$
$\Rightarrow \mu ={\mu }_r{\mu }_0=100\times 4\mu \times {10}^{-7}\text{Wb/A-m}$
$=4\pi \times {10}^{-5}\text{Wb/A-m}$