The Philosophical magazine; a journal of theoretical, experimental and applied physics . ¢0009 â¢0427 â¢107 â¢0634 â¢0420 In this tab](! L^ is IIk^ coefficient of self-induction of the of the Coefficients of Induction. 457 coil in secohms, and A is the current in amperes flowingthrouf^h it. The experiments are in fair accordance with therelation L2=-2A + -0425. Since A is proportional to ^, and Lg is proportional to 33/Ǥ,the above experiments tend to show that the pai-t of the curveof magnetization between the points corresponding with thecurrents â¢047 and 107 ampere is a parabola of the f
The Philosophical magazine; a journal of theoretical, experimental and applied physics . ¢0009 â¢0427 â¢107 â¢0634 â¢0420 In this tab](! L^ is IIk^ coefficient of self-induction of the of the Coefficients of Induction. 457 coil in secohms, and A is the current in amperes flowingthrouf^h it. The experiments are in fair accordance with therelation L2=-2A + -0425. Since A is proportional to ^, and Lg is proportional to 33/Ǥ,the above experiments tend to show that the pai-t of the curveof magnetization between the points corresponding with thecurrents â¢047 and 107 ampere is a parabola of the form 5. It was, however, desirable to see whether this relationwould still hold good for smaller magnetizing forces. Withthis view the experiments were repeated some months after-wards in a somewhat different way. The coefficient wasdetermined by comparing it with the capacity of a standardcondenser. Two arms,y>, q, of a Wheatstone bridge (see fig. 2)consisted of doubly wound resistance-coils of 10,000 ohms resistance g of the galvanometer used was also about Fig. 10,000 ohms. To the coil q was shunted a condenser of^ microfarad capacity. The opposite branch r of the bridgecontained the electromagnet whose self-induction was re-quired. The resistance of the arm s was 5 ohms, and that ofr was adjusted till there was balance. The battery used was 458 Mr. W. E. Sumpner on the Variation an accumulator. The curronts wore chanored by insertingmore or less resistance into the battery-circuit. It tlic bridgeis bahmced for steady currents, and the battery-circuit beopened, the swing di produced will be proportional toL2âKpK, where Lg is the coefficient required and K is theknown Ciijiacity. If one of the terminals of the condenser benow discoimected from the bridge, and a second swing betaken on breaking circuit, we have 60 Lo 61 LgâK/»s or L,= Kps. This method, although only comparative, has several advan-tages over Maxwells absolute method. It is
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