Notes on electricity and magnetism. designed as a companion to Silvanus P. Thompson's Elementary lessons (1891)
Murdock, J. B. (Joseph Ballard), 1851-1931, Thomson, Silvanus Phillips, 1851-1916 · New York, Macmillan & Co. · leaf 30
the centre and the potential at the surface is — • As the capacity is equal to the quantity divided by the poten-tial Capacity = — = r. r A sphere of one centimetre radius is, therefore, of unitcapacity. 18. Electric Force exerted by a Charged Plate (§ 252). Let a be the radius of the plate and r… … and the force acting nor-mal to the plate is Fig. 5 18 NOTES ON ■mrdr h \ . „ h since cos G = /r + r2 VA+rJ V/r + r* The total force exerted by the plate in a direction normalto its surface is, therefore P [a 2nrdr h . [a 2 rdr = Ttpli Integrating, = — iitph (//2 + r2)i = 2Ttph h o h (fc + a^ —…
Electricity · Magnetism
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