Electricity and magnetism for advanced students (1920)
Starling, Sydney George, 1873- · London Longmans, Green · leaf 256
rent to E and F, and thecentre of gravity of the arm can be adjusted by means of a metal flacuntil, when there is no current, the arm is horizontal when the slidingweight W is on the zero mark. The couple due to the current canthen be balanced by sliding W to the right along the arm, the… … Pig. 245. to the square of the current in the instrument, and the couple is there-fore proportional to r. Thus if d is the displacement of W required to restore equilibriumon passing the current— p X dor, i = kvd. The constant h is determined when the instrument is calibrated,and a fixed scale is…
Electricity · Magnetism
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