. THE ELECTROSTATIC FIELD. 43 That is, the rest of the charge exerts a force of 2 tz<t perunit charge on A B, and in the direction P m. When<*■ and s are measured in the absolute units, the total stresson the surface is normal thereto and of a force of 2 ?r <r x a sdynes. Or the normal… … Fig. 23. The effect of this stress can be qualitatively shown byblowing a soap bubble on a metal pipe. After closing theaperture and holding by means of some insulator, a chargemay be imparted to the pipe which is immediately com- 44 STATIC ELECTRICITY. municated to the bubble. The bubble will be…
Electronics · Electricity
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