The mathematical theory of electricity and magnetism (1911)
Jeans, James Hopwood, Sir, 1877-1946 · Cambridge [Eng.] : University Press · leaf 439
hich a current is flowing.On this disc let us suppose that an imaginary unitpole is placed at a distance r from the wire. Therewill be a couple tending to turn the disc, the moment of this couple being — x r or %. Similarly if we place a unit negative pole on the disc there isa couple — 2i. On… … 487-489] Magnetic Potential of Field 431 in any magnet is nil, it appears that the resultant couple must vanish, sothat the disc will shew no tendency to rotate. This can easily be verified. Circular Current. 489. Let us find the potential due to a current of strength i flowing in acircle of radius…
Electricity · Magnetism
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