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Q)

A proton has spin and magnetic moment just like an electron . Why then its effect is neglected in magnetism of materials?

$\begin{array}{1 1} M_p > > M_e \\ M_p = M_e \\ M_p < < M_e \\ \text{None of the above} \end{array} $

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A)
Solution :
$M= \large\frac{eh}{4 \pi m}$
=> $M \alpha \large\frac{1}{m}$
$\therefore \large\frac{M_P}{M_e}=\frac{M_e}{M_p}$
$\qquad= \large\frac{m_e}{1837 \;m_e}$
$\qquad= \large\frac{1}{1837}$$ <<1$
$M_p << M_e$
Answer :$ M_p < < M_e $
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