48. Ferromagnetism and Permanent Magnets [5P] A disk of iron has a height h = 3 mm and a radius r = 2 cm. The magnetic d

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48 Ferromagnetism And Permanent Magnets 5p A Disk Of Iron Has A Height H 3 Mm And A Radius R 2 Cm The Magnetic D 1 (59.31 KiB) Viewed 12 times

48. Ferromagnetism and Permanent Magnets [5P] A disk of iron has a height h = 3 mm and a radius r = 2 cm. The magnetic dipole moment of an atom of iron is pa = 1.8.10-23 Am². The density of the disk is p = 7.9 g/cm³. Assuming that all the iron atoms in the disk have their dipole moments aligned with the axis of the disk (positive z direction), calculate the magnetization M and the magnetic dipole moment pa of the disk and the magnetic field B 1 m afar along the axis of the disk. If we were to wrap one loop of wire around a circle of the same radius r, how much current would the wire have to carry to get the same dipole moment?