Electricity and magnetism : an elementary text-book, theoretical and practical (1920)
Glazebrook, Richard, Sir, 1854-1935 · Cambridge : The University press · leaf 199
two observations, and various rules have been framed toexpress the law found. Thus extend the right arm in a horizontal position withthe palm downwards and the thumb pointing to the left.Imagine now a current to be running down the arm from theshoulder to the fingers and that the thumb-nail… … Fig. 121 a. If the magnetic pole be above the wire the thumb must beheld uppermost and the hand twisted in the same direction as 190 ELECTRICITY [CH. XIII before, the motion of the thumb still gives the direction of theforce. Or again we may state the rule thus : Consider a right-handed screw—an…
Electricity · Magnetism
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