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Chapter 4: Q20DQ (page 947)

A cylinder of iron is placed so that it is free to rotate around its axis. Initially the cylinder is at rest, and a magnetic field is applied to the cylinder so that it is magnetized in a direction parallel to its axis. If the direction of the external field is suddenly reversed, the direction of magnetization will also reverse and the cylinder will begin rotating around its axis. (This is called the Einstein–de Haas effect.) Explain why the cylinder begins to rotate.

Short Answer

Expert verified

The cylinder becomes magnetized it acquires a magnetic moment and angular momentum which causes the cylinder to start rotate.

Step by step solution

01

Magnetic moment

The moment is perpendicular to the plane of the orbit. The electron also has mass, since it is in orbit it will have an associated angular momentum. The angular momentum is in the same direction as the magnetic moment. As the cylinder becomes magnetized it acquires a magnetic moment and angular momentum which causes the cylinder to start rotate.

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