An iron rod of susceptibility 599 is subjected to a magnetising field of 1200Am−11200 A m^{-1}1200Am−1. The permeability of the material of the rod is : (μ0=4π×10−7TmA−1\mu_0 = 4\pi \times 10^{-7} T m A^{-1}μ0=4π×10−7TmA−1)
2.4π×10−4TmA−12.4\pi \times 10^{-4} T m A^{-1}2.4π×10−4TmA−1
8.0×10−5TmA−18.0 \times 10^{-5} T m A^{-1}8.0×10−5TmA−1
2.4π×10−5TmA−12.4\pi \times 10^{-5} T m A^{-1}2.4π×10−5TmA−1
2.4π×10−7TmA−12.4\pi \times 10^{-7} T m A^{-1}2.4π×10−7TmA−1
μr=1+χm=1+599=600\mu_r = 1 + \chi_m = 1 + 599 = 600μr=1+χm=1+599=600. μ=μ0μr=4π×10−7×600=2400π×10−7=2.4π×10−4TmA−1\mu = \mu_0 \mu_r = 4\pi \times 10^{-7} \times 600 = 2400\pi \times 10^{-7} = 2.4\pi \times 10^{-4} T m A^{-1}μ=μ0μr=4π×10−7×600=2400π×10−7=2.4π×10−4TmA−1
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