A rotating spherical shell of uniform surface charge and mass density has total mass M and charge Q. If its angular momentum is L and magnetic moment is μ, then the ratio μ/L is
1
\(\rm\frac{Q}{3M}\)
2
\(\rm\frac{2Q}{3M}\)
3
\(\rm\frac{Q}{2M}\)
4
\(\rm\frac{3Q}{4M}\)