An insulting thin rod of length `l` has a linear charge density `rho(x)=rho_(0)(x)/(l)` on it. The rod is rotated about an axis passing through the origin (x=0) and perpendicular to the rod. If the rod makes n rotations per second, then the time averaged magnetic moment of the rod is :
A
`pi nrhol^(3)`
B
`(pi)/(3)nrhol^(3)`
C
`(pi)/(4)nrhol^(3)`
D
`nrhol^(3)`
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