Q 1 :    

An iron rod of susceptibility 599 is subjected to a magnetising field of $1200$ $\mathrm{A}$ ${\mathrm{m}}^{-1}$. The permeability of the material of the rod is $({\mu }_0=4\pi \times {10}^{-7}$$\mathrm{T} \mathrm{m} {\mathrm{A}}^{-1})$    [2020]
 

• $2.4\pi \times {10}^{-4}$$\mathrm{T} \mathrm{m} {\mathrm{A}}^{-1}$

   

• $8.0\times {10}^{-5}$$\mathrm{T} \mathrm{m} {\mathrm{A}}^{-1}$

   

• $2.4\pi \times {10}^{-5}$$\mathrm{T} \mathrm{m} {\mathrm{A}}^{-1}$

   

• $2.4\pi \times {10}^{-7}$$\mathrm{T} \mathrm{m} {\mathrm{A}}^{-1}$