If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by $\mu $d, $\mu $p and $\mu $f respectively, then
${\mu _d} = 0$ and $\mu $p $ \ne $ 0
$\mu $d $ \ne $ 0 and $\mu $p = 0
$\mu $p = 0 and $\mu $f $ \ne $ 0
$\mu $d $ \ne $ 0 and $\mu $f $ \ne $ 0.
Solution
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