Magnetism And Matter Ques 11
11. 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
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(a) $\mu_d=0$ and $\mu_p \neq 0$
(b) $\mu_d \neq 0$ and $\mu_p=0$
(c) $\mu_p=0$ and $\mu_f \neq 0$
(d) $\mu_d \neq 0$ and $\mu_f \neq 0$
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Answer:
Correct Answer: 11.(a)
Solution:
The magnetic dipole moment of diamagnetic material is zero because each electron has a paired opposite spin, i.e., $\mu_d=0$.
Paramagnetic substances have a dipole moment $>0$, i.e. $\mu_p \neq 0$, due to unpaired electrons in its molecules spinning in the same direction.
Ferro-magnetic substances are very strong magnets and they also have permanent magnetic moment, i.e. $\mu_p \neq 0$.
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