The magnetic moment vectors `mu_(s) and mu_(l)` associated with the intrinsic spin angular momentum S and orbital angular momentum l, respectively, of an electron are predicted by quantum theory (and verified experimentally to a high accuracy) to be given by :
`overset(to)(mu_(s) ) = -((e)/(m)) S, overset(to)(mu_(l)) = - ((e)/( 2m)) overset(to)(l)`
Which of these relations is in accordance with the result expected classically ? Outline the derivation of the classical result.