. The London, Edinburgh and Dublin philosophical magazine and journal of science . the other will be included in the battery. The self-inductionof the latter coil produces no effect on the galvanometer ; thisis likewise the case with R, because there is no permanentcurrent through it. The coefficient of mutual induction will,as usual, be denoted by M; the other coil is placed in AD, asin the figure. In dealing with this case the galvanometer, coil R, BC, CDmust be looked upon as lying in one Thus, T=i(Li* + ), Y = i{cx2 + + dy<2 + £ + + +Bi2},We observe
. The London, Edinburgh and Dublin philosophical magazine and journal of science . the other will be included in the battery. The self-inductionof the latter coil produces no effect on the galvanometer ; thisis likewise the case with R, because there is no permanentcurrent through it. The coefficient of mutual induction will,as usual, be denoted by M; the other coil is placed in AD, asin the figure. In dealing with this case the galvanometer, coil R, BC, CDmust be looked upon as lying in one Thus, T=i(Li* + ), Y = i{cx2 + + dy<2 + £ + + +Bi2},We observe also that Thus, w0 = 0, x=yQ. a . x- + ex + G . x — u = —L^o, —z + dy + ~—u= -Mi0,-G(x-u) -R(*/-w) = -M*0. 236 Prof. C. Niven on Determining and ComparingIf x — u=<y, (a + c + G)y + a + c. u—az=— Li? which we obtain, eliminating ut z and puttingx0 = z0b/(b + d), z0=E(b + d)/( + d + + b), B(ej±g^Ly)) (« + c+ + + -^-J( + rf + + 6) B, it must be remembered, includes the resistance of one ofthe coils as well as that of the battery. R includes the resistance of the other coil of the pair, withthe additional resistance necessary to neutralize the kick ofthe galvanometer. For example, the coefficient of inductionof a certain pair of coils used for experimental purposes wascompared with the coefficient of self-induction of the field-magnets of an old dynamo of the Ladd pattern. The resist-ance of one of the coils (that put as a shunt to the gal
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