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By F. A. Annett

Electric equipment: a pragmatic research path on install, operation and upkeep

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Sample text

Parts are placed together again it will be found that the magnetic poles of each piece will disappear at the division and be present FIG. 20. at the two ends, as shown in Fig. 20. There Results of placing together parts of magnet, Fig. 19. one conclusion to draw from this fact, and that is, if the magnet is broken up into infinitely small pieces, each piece will be a magnet with a north and a south pole. Theory of Magnetism. There are many theories of magnetism, but the one given preference to-day is based on the It must be remembered that just foregoing hypothesis.

Heads. determined by the compass, FIG. 28. Shows if the wire direction of compass is grasped in the when placed near an electric conductor. right hand- with the fingers pointing around the conductor in the direction that the compass points, the thumb, when pointing along the conductor, will indicate the direction of the current, as illustrated in the figure . Magnetic Field Around a Number of Conductors. In Fig. 29 are represented two parallel conductors having an FIG. 29 FIG. 30 FIGS. 29 and 30.

Consequently, if we wish to arrow know which direction of current the cross represents, we may reason like this The cross represents the tail of the arrow, therefore the arrow must be pointing away from the ob: server for this part to be seen. Hence, the cross represents current flowing away from the reader. Likewise for the dot The arrow must be it represents the point of the arrow. ; pointing toward the observer for the point to be seen, consequently, the direction of the current which it represents.

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