A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 797
in the fact that on any piece ofiron or steel the total amount of N poleis alwaya equal to the total amount ofs pole because I be act of magnetisation does not involve the puttingof pole on the bar or needle, but merely the arrangement of themolecular magneta as in Fig. 709. This may be proved by… … Fig. 711.—Magnet floated on water. lxi MAGNETISATION OF IRON AND STEEL 773 not move bodily either north or south. Thus, the forces on theN and S poles are equal and opposite, giving rise to a couple butnot to a resultant force of translation. This shows that the totalamounts of N and of S pole are…
Physics
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