Question

The magnetic susceptibility of a rod is $499$. The absolute permeability of vacuum is $4\pi \times {10}^{-7}H/m$. The absolute permeability of the material of the rod is

• A. $\pi \times {10}^{-4}H/m$
• B. $2\pi \times {10}^{-4}H/m$
• C. $3\pi \times {10}^{-4}H/m$
• D. $4\pi \times {10}^{-4}H/m$

Answer 1

Answer: (B)

$2\pi \times {10}^{-4}H/m$

$\chi$=499
$\mu ={\mu }_r{\mu }_0$
${\mu }_r=\chi +1$
${\mu }_r$=500
$\mu =4\pi \times {10}^{-7\times 500}$
$=2\pi \times {10}^{-4}$ H/m