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

Explanation

The comparison b etween the spinning of a proton and an electron can be done by comparing their magnetic dipole moment which can b e given by
`M=(eh)/(4 pim)"or" M=(1)/(m) (because (eh)/(4pi)="constant")`
`therefore (M_(P))/(M_( e))=(m_(b))/(m_(p))`
`=(M_(e))/(1837M_(e)) (because M_(p)=1837 m_(e))`
`rArr (M_(P))/(M_(e))=(1)/(1837)ltlt1`
`rArr (M_(P)ltltM_(e)` ltbr. Thus, effect of magnetic moment of proton is neglected as compared to that of electron.