Q. The magnetic susceptibility of a material of a rod is 499. The absolute permeability of vacuum is$\ 4\pi \times 10^{- 7}\ HM^{- 1}$. The absolute permeability of the material of a road is
A) $\pi \times 10^{- 4}\ HM^{- 1}$
B) $2\pi \times 10^{- 4}\ HM^{- 1}$
C) $3\pi \times 10^{- 4}\ HM^{- 1}$
D) $4\pi \times 10^{- 4}\ HM^{- 1}$
Explanation
(b) Absolute permeability of material of rod
$\mu = \mu_{r}\mu_{0} = \left( 1 + X_{m} \right)\mu_{0}$
$\therefore\ \mu = (1 + 499) \times 4\pi \times 10^{- 7} = 2\pi \times 10^{- 4}\ Hm^{- 1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.