Electricity and magnetism : an elementary text-book, theoretical and practical (1920)
Glazebrook, Richard, Sir, 1854-1935 · Cambridge : The University press · leaf 248
vary as thelength of the arc, and this is reasonable, for each small elementof the arc must, it is clear, contribute equally to the force, itmust also vary inversely as the square of the radius. Thusthe force will vary as Iji^. 157. Commutators. In experiments with electriccurrents it is often… … Fig. 150. A, B, C, D are mercury cups arranged at the corners of asquare and connected to binding screws as shewn. The battery wires are connected to A and G, the circuit inwhich the current is to be reversed to £ and D. Two pieces of stout copper wire or rod are bent asshewn in the figure and…
Electricity · Magnetism
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