Answer & explanation
Correct answer: option 4
$ \mu_R = \frac{B}{H\mu_0} = \frac{8\pi}{2\times 10^3 \times 4\pi \times 10^{-7}} = 10^4$
Correct answer: option 4
$ \mu_R = \frac{B}{H\mu_0} = \frac{8\pi}{2\times 10^3 \times 4\pi \times 10^{-7}} = 10^4$