Electrical measurementsA laboratory manual . rved Deflections. Corrected Deflections. II. The quantity is inversely proportional to the resistance ofthe secondary circuit. Resistance of 1 Observed Corrected Secondary. B Deflections. Deflections. 7000 .0001429 17000 .0000588 27000 370 37000 270 47000 213 57000 175 87000 115 107000 0934 The firs
Electrical measurementsA laboratory manual . rved Deflections. Corrected Deflections. II. The quantity is inversely proportional to the resistance ofthe secondary circuit. Resistance of 1 Observed Corrected Secondary. B Deflections. Deflections. 7000 .0001429 17000 .0000588 27000 370 37000 270 47000 213 57000 175 87000 115 107000 0934 The first and third columns of the first table and the secondand fourth of the second table are plotted as coordinates in ^ _^ ^ y^ ^ ^^ <f ^ y y6 J^ ^ n ^ ^ ^ ^ ?^ ^ ^ ^ t 16 18Fie. 123. 23 24 26 2S SELF-INDUCTION AND MUTUAL INDUCTION. 265 Fig. ;in. The result in both cases is a straight line throuo;h the 123. Comparison of Two Mutual Inductances.^ —Let ^1, Ao (Fig. 124) be the two coils whose mutualinductance M^ is Q AAAAAA-^fAAAAA. Fig. 124. to be compared with the mutual inductance il/j^ of the coils A:i, A^. The coils , A^ are placed in the required relation to each other, while Ai and Ao must be at such a distance from A^ and A^ that there is no mutual inductance between Ai and Ai, nor between and As. The coils are joined in series as shown. Then the resistances of the branches containing Ai and A^ must be varied by the addition of non-inductive resistances till the galvanometer shows no deflection on closing and opening the key K, The sensibility will be increased by the use of the double commutator. When a balance has been obtained, if,. The theory is as follows: Write the potential differ-ence by the three paths between P and Q and placethem equal to one another. Then dii (H-i di\ Mu^ -Will -R,h=M,,^^^dt dt dt L,^-B,h^Bz + L^. dt ? dt R^ 2, and L are the resistance, current, and inductance MaxwelVs Flee, and Mag., Vol. II., p. 364. 266 ELECTRICAL MEASUREMEN
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