let us considerany two points M, M of the given in-fluencing body and the correspondingimaginary points /, /; and let us takethe force between M and I, and alongwith it the force between / and M\These two forces lie in the plane MCM, since, by the con-struction given above, / and I are respectively… … a , a ——,m .m -p-ni.m FT , or a force of attraction equal to ^-rr Similarly, we find ^ a ,—zm.m for the attraction between M and /. Now since, by construc-tion, CM.01=1 CM.Cr, the triangles IMG, IMG, which havea common angle at C, are similar. Hence rM^_GI\CM_fJ__IM^~CI.CM~ a^ from which we deduce…
Electricity · Magnetism
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