Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 127
the sphere can be proved the same as if itwere condensed in its centre. Thus, if the charge be Q, andthe radius B, the force on a + unit at a distance D from the centre is ™, and that just outside the surface is -™- The density is 1 7—=-:—™, which shows that the den- J area of surface IttIi* io8… … Fig. 69. potential at distance D. Hence the potential close to thesurface is v^V suppose. Hence Q=FB, and therefore R measures the capacity of the sphere, or the charge per unitpotential (Art. 69). 81. Electrification of two Parallel Plates, oneinitially charged.—As an instructive example of…
Electricity
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