Solution to task 430 from Chertov´s for extramural stud

Solution to task 430 from Chertov´s for extramural stud

430. The charge Q = 60nC is evenly distributed over a thin rod l = 40 cm long. The rod rotates with a frequency of n = 12 s-1 about an axis perpendicular to the rod and passing through the rod at a distance a = l / 3 from one of its ends. Determine the magnetic moment pm due to rotation of the rod.