Question

An iron rod of susceptibility 599 is subjected to a magnetising field of 1200 A $m^{-1}$. The permeability of the material of the rod is :
$(\mu_o = 4\pi \times 10^{-7} T\,m\,A^{-1})$

• A. $2.4 \pi \times 10^{-4} T\,m\,A^{-1}$
• B. $8.0 \pi \times 10^{-5} T\,m\,A^{-1}$
• C. $2.4 \pi \times 10^{-5} T\,m\,A^{-1}$
• D. $2.4 \pi \times 10^{-7} T\,m\,A^{-1}$

Answer 1

Answer: (A)

Given, $\chi_{m}=599$
Also, $\mu_{r}=1+\chi_{m}=600$
We know, $\mu=\mu_{r}\mu_{o}$
$\mu=600\times4\pi\times10^{-7}$
$\mu=2400\pi\times10^{-7}$
$\mu=2.4\pi\times10^{-4}\,T\,m\,A^{-1}$