An insulting thin rod of length has a x linear charge density p(x)= on it. The rod is rotated about an axis passing through the origin (x=0) and the perpendicular to the rod. If the rod makes n rotations per second, then the time averaged magnetic moment of the rod is : 

(a) 
nρ 
(b) 

(c) 

(d) 

An insulting thin rod of length has a x linear charge density p(x)= on it. The rod is rotated about an axis passing through the origin (x=0) and the perpendicular to the rod. If the rod makes n rotations per second, then the time averaged magnetic moment of the rod is : 

(a) 
nρ 
(b) 

(c) 

(d) 
