A Manual of Physical Measurements
A Manual of Physical Measurements
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Selfinductance of a Coil Compared with a Standard. Arrange the apparatus as in Fig. 109, in which the two selfinductances form each one arm of a Wheatstone bridge. Let their re- sistance and selfinductance be R : and L lf R 2, and L 2 respectively. The re- maining two arms are formed by the noninductive resistances R ?i and R t . First adjust R 3 and R 4 for constant current until the galvanometer shows no deflection on closing k, that is, Fig. 109.
R* (209) Then, keeping k closed, open K. Ther...e will in general be a de- l88 PHYSICAL MEASUREMENTS flection of the galvanometer due to the difference of the E. M. F. Produced by the selfinductances in the branches Z^ and L. 2 . Vary the selfinductance of the standard, until upon opening K no de- flection is obtained. Then the points connected to the galvanom- eter will be at the same potential as well during the steady as during the variable state of the current.
Let the difference of potential over R^ or R 2 for a constant cur- rent be B ; then the current through R^ is i i = 'E/R 1, and through R 2J i, = n/R 2 .
What to read after A Manual of Physical Measurements?
You can find similar books in the "Read Also" column, or choose other free books by John Oren Reed to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Selfinductance of a Coil Compared with a Standard. Arrange the apparatus as in Fig. 109, in which the two selfinductances form each one arm of a Wheatstone bridge. Let their re- sistance and selfinductance be R : and L lf R 2, and L 2 respectively. The re- maining two arms are formed by the noninductive resistances R ?i and R t . First adjust R 3 and R 4 for constant current until the galvanometer shows no deflection on closing k, that is, Fig. 109.
R* (209) Then, keeping k closed, open K. Ther...e will in general be a de- l88 PHYSICAL MEASUREMENTS flection of the galvanometer due to the difference of the E. M. F. Produced by the selfinductances in the branches Z^ and L. 2 . Vary the selfinductance of the standard, until upon opening K no de- flection is obtained. Then the points connected to the galvanom- eter will be at the same potential as well during the steady as during the variable state of the current.
Let the difference of potential over R^ or R 2 for a constant cur- rent be B ; then the current through R^ is i i = 'E/R 1, and through R 2J i, = n/R 2 .
What to read after A Manual of Physical Measurements?
You can find similar books in the "Read Also" column, or choose other free books by John Oren Reed to read onlineMoreLess
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