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 225
p. Let P be the point, and PX or ^ the normal to the plane. Take any small cone having its apex at P. Let the solid-angle of this cone be (s>*, let its length be r; and 0 the angle its axis makes with a. The cone meets the_ surface of the plane obliquely, and if an orthogonal section be made… … Fig. 99. charge on oblique section = ^(jjpcos d cos 6 Hence if a + ufiit of electricity were placed at P, the force exerted on this by this small charge = ——^ x i -^ r^ ^ cos ^ or _ copcos 0 Resolve this force into* two parts, one acting along the plane,the other along ^, normal to the plane. The…
Electricity · Magnetism
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