Solution to task 429 from Chertov´s for extramural stud

Solution to task 429 from Chertov´s for extramural stud

429. Charge Q = 0.2 μC is evenly distributed over the surface of the disk with radius R = 15 cm. The disc rotates with an angular velocity ω = 30 rad / s about an axis perpendicular to the plane of the disc and passing through its center. Determine the magnetic moment pm due to the rotation of the disk.