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Magnetic Permeability

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-306

2025-11-29

689

Lines of force pass through air and other nonmagnetic substances with greater difficulty than through iron. When a piece of iron is introduced into a space where there are lines of magnetic force, it offers a path of less resistance, and causes a distortion of the lines of force from their previous distributions. The iron, offering a smaller resistance to the passage of the lines of force than the air, is said to have a greater permeability. For this reason, a watch in a thin iron case does not become magnetized.

FIG.1

Demonstration. - Suspend a nail from near one end of a bar magnet, as in Fig. 1. Slide a second magnet of equal strength over it and observe results. Reverse the second magnet, and again slide it over the first. Explain both results.