Advanced theory of electricity and magnetism; A text-book for colleges and technical schools (1915)
Franklin, William S. (William Suddards), 1863-1930, MacNutt, Barry, 1878-1936. joint author · New York, Macmillan · leaf 165
154 ADVANCED ELECTRICITY AND MAGNETISM. Tension of the electric field in air.—Putting k = i andpwriting e for — in equation (7) of Art. 90 we get: F = ^-ae* (5) Now the force F which tends to pull the two plates togethershows that the intervening electric field is in tension and theforce per unit… … Fig. 100. Equations (4) and (6) are here derived for a very special casebut they give the energy per unit volume and the tension at apoint in any electric field in air. 92. The electric field in the region between two concentricmetal spheres.—A metal sphere of radius A is surrounded bya hollow…
Electricity · Magnetism
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