Thomson, J. J. (Joseph John), 1856-1940 · New Haven, Yale University Press · leaf 50
electric force are radial; those of magnetic forceare circles having for a common axis the line of mo-tion of the centre of the sphere; the momentum at a point P is at rightangles to each of thesedirections and so is atright angles to OP inthe plane containingPand the line of motionFlG- 10- of the… … ELECTRICAL MASS 37 surrounding the sphere, ^tt^Nv sin 0, v beingthe velocity of the sphere and 6 the angleO P makes with the direction of motion ofthe sphere. By the rule given on page 25 themomentum in unit volume of the medium at P isi\^X ^tt\lNv sin 0, or ^-n^N^v sin 0, and isin the direction of…
Electricity · Matter · Radioactivity
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