Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Test-needle. EARTHS MAGNETISM. 47. and repulsion on one pole may, therefore, be considered equaland opposite, so that the bar is simj:>ly directed, and thereis no motion of translation. The distance through whichthe earths magnetic pole at-tracts the N-pole of a mag-netic needle is less than thedistance through which theS-pole of the needle is re-pelled by the earths difference in the dis-tances between the two polesof the earth is so small (equalto the length of the m
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Test-needle. EARTHS MAGNETISM. 47. and repulsion on one pole may, therefore, be considered equaland opposite, so that the bar is simj:>ly directed, and thereis no motion of translation. The distance through whichthe earths magnetic pole at-tracts the N-pole of a mag-netic needle is less than thedistance through which theS-pole of the needle is re-pelled by the earths difference in the dis-tances between the two polesof the earth is so small (equalto the length of the magnet)that the force of attraction ispractically no greater than that of repulsion. The needle,therefore, turns in the direction of the two forces, but thereis no motion of translation. If the pole of another magnetbe approached to the floating magnet, Fig. 65, at such a dis-tance that the length of this magnet is considerable, as com-pared with the distance between the two magnets, then thefloating needle will be both directed and attracted. 57. Neutralizing the Earths Attractive Force for aNeedle.—Hold above, and parallel to a compass n
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