Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 27
ion of the field of a magnet. Let NS, Fig. 2, be a magnet of pole strength m, and n a unit north pole.The pole N of the magnet repels the unit pole with a force = ra/ri2 dynes,represented in magnitude and direction by the line na; the pole S of the mag-net attracts the unit pole with a force =… … Fig. 3.—Lines of force surrounding a bar magnet. 4. Lines of Force.—In dealing with magnetic problems itis found convenient to represent the magnetic field diagram-matically by what are called lines of force. These are con-tinuous lines whose direction at any point in the field is that ofthe force…
Electrical engineering
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