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 :
(µ
0
=4π×``10^{-7}`` T m A-1)
(1) 2.4π×``10^{-4}`` T m A-1
(2) 8.0×``10^{-5}`` T m A-1
(3) 2.4π×``10^{-5}`` T m A-1
(4) 2.4π×``10^{-7}`` T m A-1