NEET-XII-Physics
neet 2020 questions with solutions year:2020
- #36An 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_o = 4\pi \times 10^{-7} T\,m\,A^{-1}) ``
(A) `` 2.4 \pi \times 10^{-4} T\,m\,A^{-1} ``
(B) `` 8.0 \pi \times 10^{-5} T\,m\,A^{-1} ``
(C) `` 2.4 \pi \times 10^{-5} T\,m\,A^{-1} ``
(D) `` 2.4 \pi \times 10^{-7} T\,m\,A^{-1} ``
digAnsr: AAns : Given, `` \chi_{m}=599 ``
Also, `` \mu_{r}=1+\chi_{m}=600 ``
We know, `` \mu=\mu_{r}\mu_{o} ``
`` \mu=600\times4\pi\times10^{-7} ``
`` \mu=2400\pi\times10^{-7} ``
`` \mu=2.4\pi\times10^{-4}\,T\,m\,A^{-1} ``