A laboratory course in experimental physics (1896)
Loudon, W. J. (William James), McLennan, John Cunningham, joint author · New York and London, Macmillan and Co. · leaf 197
in a quan-tity of positive magnetismwhich is not associated withan equal quantity of theopposite kind. Althoughwe cannot obtain a magnetwith only one pole, it isoften useful in facilitatingcalculation to consider asingle pole as existing byitself, always remembering,of course, that it is a… … Fig. 1. MAGNETIC LINES OF FORCE. 183 The field of a magnet is the region in which it exerts anyforce, and the intensity of a magnetic field at any point is theforce exerted by the magnet on a unit pole, supposed placedat this point. If we were to imagine a free unit pole placedin a magnetic field,…
Physics
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