easily be shown by the gold-leaf electro-scope, which shows only slight electrification when ap- THE ELECTROSTATIC FIELD. 23 proached to the open sheet of foil, but shows much moreintense electrification when approached to the foil whenrolled up. Or a spark may be drawn from the cylinder offoil… … Fig. 7. sphere have a radius r, its surface is 4-r2, and if a chargeof q units of electricity be imparted to it, then its surface q density at any point is j^« This condition of uniform density may be representedas in Fig. 8 a, where the dotted line shows the thicknessof the fluid on the surface of…
Electronics · Electricity
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