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