By Eric Gerard
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2m, is is balanced by the resultant 3C^( m) of the actions on the second. two points which, in the mathematical theory of magnetism, receive more particularly It must be observed, however, that the the name of poles. are thus defined have no more physical existwhich poles These resultants are applied at ence than has the centre of gravity of a body. nary line passing through the poles is An imagi- called the magnetic The distance / between the poles is axis of the magnet. the true length of the magnet.
Suspended by its centre of gravity, one 33. When of a magnet poles is inthe the towards other directed towards the north, variably south. For this reason the first pole is called the north or is its N-/0/^, th2 second, the south or $-pole. 34. Law of Magnetic Attractions. If several magnets are placed near each other, it is observed that the poles of the same name repel each other and that those of contrary name sents attract each other. some difficulties, The study because it is of these actions pre- not possible to investi- gate the reciprocal action of two isolated poles.
Under these conditions we call the ratio of the magnetic mass of the poles to their surface the density of the poles or = : . s Now, calling the length of the magnet /, we have ml = 2fll, follows that the density and intensity of magnetV\ ization have the same numerical expression and the same it si dimensions. Let SN (Fig. 9) be an elementary magnet whose poles of P V~~" FIG. 9. mass m potential in this point is L As L Li \L' from L' by only an we can replace LL' by D, and L angle The magnetic are at distances Z, L' from a point P.
Electricity and Magnetism by Eric Gerard