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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: ($\mu_0=4\pi\times10^{-7}\ T\,m\,A^{-1}$)
A
$8.0\times10^{-5}\ T\,m\,A^{-1}$
B
$2.4\pi\times10^{-5}\ T\,m\,A^{-1}$
C
$2.4\pi\times10^{-7}\ T\,m\,A^{-1}$
D
$2.4\pi\times10^{-4}\ T\,m\,A^{-1}$
Detailed Solution
$\chi_m = 599 \Rightarrow \mu_r = 1 + \chi_m = 600$
$\mu = \mu_r\mu_0 = 600 \times 4\pi \times 10^{-7} = 2400\pi \times 10^{-7}$
$\mu = 2.4\pi \times 10^{-4}\ T\,m\,A^{-1}$