Permeability of a medium from its magnetic susceptibility

1. A.
   $2\pi \times 10^{- 4}$ SI units
2. B.
   $2\pi \times 10^{- 7}$ SI units
3. C.
   $\frac{5\pi}{4} \times 10^{- 7}$ SI units
4. D.
   $\frac{4\pi}{5} \times 10^{- 4}$ SI units

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1. A.
   $4\pi \times 10^{- 7}$
2. B.
   $4\pi \times 10^{- 4}$
3. C.
   $4\pi \times 10^{- 5}$
4. D.
   $4\pi \times 10^{- 6}$

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1. A.
   $\chi = \frac{\mu}{\mu_{0}} - 1$
2. B.
   $\chi = \frac{\mu_{r}}{\mu_{0}} + 1$
3. C.
   $\chi = \mu_{r} + 1$
4. D.
   $\chi = 1 - \frac{\mu}{\mu_{0}}$

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