Electricity and magnetism for advanced students (1920)
Starling, Sydney George, 1873- · London Longmans, Green · leaf 243
field outside it is —, at a distance r from the axis, but that inside it will be different. For let Vi be thedistance from the axis of a point inside the wire, and let j\ be the 232 ELECTRICITY AND MAGNETISM CHAP. current density, that is the current flowing through unit area of cross-section of… … 2(^n\) = 2irri«i = --r, Fig. 229. where i is the whole current-!Tr\. This is the actual strengthof field, since the current inthe cylindrical shell lying out-side the point, does not pro-duce any field within it, thecircular path inside not en-closing any of this current. Thus the field due to a…
Electricity · Magnetism
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