Q133 / 150 · MHT CET 2021 (22 Sep Shift 2) · Physics

The relative permeability of iron is 2000 . Its absolute permeability in SI unit will be $\left(\frac{\mu_0}{4 \pi}=10^{-7}\right.$ SI unit $)$

  • A
    $8 \pi \times 10^{-7}$
  • B
    $4 \pi \times 10^{-5}$
  • Correct answer
    C
    $8 \pi \times 10^{-4}$
  • D
    $\frac{500}{\pi} \times 10^{-7}$

Solution

$\begin{aligned} & \mu=\mu_{\mathrm{r}} \mu_0 \\ & =2000 \times 4 \pi \times 10^{-7} \\ & =8 \pi \times 10^{-4} \text { SI unit }\end{aligned}$

Hence, the correct answer is option: 'C'.

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