Question
netic field to magnitude I T. What is the torque on the electron? Calculate the magnetic dipole moment of a single atom, based on the following model: One electron travels at speed 2.2 times 106 m/s in a circular orbit of diameter 10-10m. The individual atomic magnetic dipoles of magnetic materials (such as iron) are preferentially lined up to point in the same direction. If a fraction f of the dipoles are so aligned along the long axis with the rest oriented randomly so that their magnetic dipole moments add vectorially to zero), what is the net magnetic dipole moment of a piece of such material 1 cm2 in area and 10 cm long? (The material may be viewed as an array of cubes, each of which contains one atom and is 10-10 m on a side.) What is the torque experienced by the piece of material in part (b) in a field of 10-3 T when the magnetic field is directed at right angles to the long axis to the material.
Explanation / Answer
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