Magnetic Field; Measurements
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-308
2025-11-29
12
A magnetic field is a space in which there are lines of magnetic force. The field usually considered is some limited area, always perpendicular to the lines of force.
If the like poles of two magnets of equal strength, when one centimeter apart, repel each other with a force of one dyne, each is called a unit pole. A magnetic field of unit strength is one where a unit pole would be acted upon with a force of one dyne. One line of force is called a maxwell. A magnetic field of unit intensity, that is, one having one line of force per square centimeter, is called a gauss.
A small bar of hardened steel will retain about 800 lines of force per square centimeter; that is, the intensity of its field is 800 gausses, and if the bar is 2 cm. wide and 1 cm. thick, there are 1600 maxwells in the field adjacent to the end of the magnet.
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