If $\mu_0$ is the permeability of vacuum and $\chi_m$ is the magnetic susceptibility, then the permeability of the material $\mu$ is . . . . . . .
- A$\mu = \mu_0(1 + \chi_m)$
- B$\mu = \mu_0(\chi_m - 1)$
- C$\mu = \mu_0(1 - \chi_m)$
- D$\mu = \mu_0(1 + \chi_m^2)$
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