A disk of radius R = 10 cm carries a charge Q = 0.2 μC uniformly distributed over the surface. The disk rotates uniformly with a frequency n=20 s-1 relative to an axis perpendicular to the plane of the disk and passing through its center. Determine: 1) magnetic moment pm of the circular current created by the disk; 2) the ratio of the magnetic moment to the angular momentum (pm/L), if the mass m of the disk is 100 g.
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