Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . ntofilings. It now attractsmore filings than be-fore. Magnetic induc-tion thus takes placebetween bodies in con-tact or separated from each other. Interpose between the adjacentends of the magnet and iron bar pieces of brass, lead, glass, rubber,copper, etc. The filings are attracted to the same degree, when thesame distance is maintained, as when these bodies are not interposed. (3) Support a piece of iron rod about eight inches long, horizontally, in line with, and on the sameheigh
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . ntofilings. It now attractsmore filings than be-fore. Magnetic induc-tion thus takes placebetween bodies in con-tact or separated from each other. Interpose between the adjacentends of the magnet and iron bar pieces of brass, lead, glass, rubber,copper, etc. The filings are attracted to the same degree, when thesame distance is maintained, as when these bodies are not interposed. (3) Support a piece of iron rod about eight inches long, horizontally, in line with, and on the sameheight, as a poised magneticneedle, when it is pointingtoward the N and S, as inFig. 42. Leave a small dis-tance between the end of theiron rod and the N-pole ofthe needle. The N-pole of Fig. 42.—Magnetic Induction. the needle induces a S-pole in the iron nearest to it,and a N-pole at the far end, and is attracted to the bar by the phe-nomenon of magnetic induction. With the N-pole of a bar magnetapproach the far end of the iron rod, and the needle is repelled away28 Fig. Iron Filing*41.—Magnetic ?£nt4*3~ ?xu/S&ubJl* MA GNETIC IND UCTION. 29 from the iron rod. The bar magnet, (the inducing body) beingstronger than the needle, induces a S-pole in the end of the ironnearer to it, and a N-pole in the other end ; thus not only neutraliz-ing the needles inductive effect, but demagnetising the iron, andmagnetising it again in the opposite direction. When the magnet-ising body is removed the needle assumes its former inductive posi-tion, provided that the iron is very soft. This experiment proves thatthe iron has poles when inductively magnetised. To prove that thebar magnet is not repelling the needle, repeat the test without theiron bar interposed and with the magnet at the same distance, whenthe needle will be only slightly deflected. (4) The amount of deflection will not be altered in the above ex-periment when pieces of non-magnetic bodies are interposed. Inter-pose a
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