Q. 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 : ($\mu_0 = 4\pi \times 10^{-7}$ T m $A^{-1}$)
A) $8.0 \times 10^{-5}$ T m $A^{-1}$
B) $2.4\pi \times 10^{-5}$ T m $A^{-1}$
C) $2.4\pi \times 10^{-7}$ T m $A^{-1}$
D) $2.4\pi \times 10^{-4}$ T m $A^{-1}$
Explanation
[Solution] $\mu = \mu_0(1 + \chi) = 4\pi \times 10^{-7} \times 600 = 2.4\pi \times 10^{-4}$ T m $A^{-1}$. The source key gives (1), which is incorrect. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.