Q. Two particles, each of mass m and charge q, are attached to the two ends of a light rigid rod of length 2R. The rod is rotated at constant angular speed about a perpendicular axis passing through its center. The ratio of the magnitudes of the magnetic moment of the system and its angular momentum about the center of the rod is
(a) q/2m
(b) q/m
(c) 2q/m
(d) q/πm
Ans: (a)
Sol: M/L = q/2m