Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 219
ace AB. The chargeon AB would repel a + unitplaced at P with a certainforce. Now draw the linesAD and BC through P, andregard these as mapping outa small conical surface of ^^^- 9^- two sheets, having its apex at P; the small area CDwill represent the end of the opposed cone, and theelectricity on… … 202 ELEMENTARY LESSONS ON [chap, iv the forces which they exercise on P exactly neutraliseone another (as experiment shows they do), it is clearthat the electric force must fall off inversely as thesquares of the distances; for the whole surface of thesphere can be mapped out similarly by imaginary…
Electricity · Magnetism
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