Electricity and magnetism : an elementary text-book, theoretical and practical (1920)
Glazebrook, Richard, Sir, 1854-1935 · Cambridge : The University press · leaf 341
/ = n/land the value of the force^ is iirNi. 202. Astatic Coil. If the coil be as in Fig. 195 theearths magnetic Held acts on it and may render it unsuitablefor delicate observations, it can however be rendered astaticby bending the wire as in Fig. 200. … Fig. 200. If the current flow as indicated by the arrows the faceof ABODE turned towards the reader is a north pole, that ofEFGHl a south pole, the earth acts equally and oppositelyon the two and the system is astatic. 203. Electromagnetic Forces. We may regardthe above results somewhat differently…
Electricity · Magnetism
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