Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . the magnets poles. QUESTIONS. 1. Explain what you understand by the molecular theory of mag-netism. Give sketches. 2. Sketch several possible positions of the molecules in an unmag-netised piece of steel. 3. What is meant by a magnetically satisfied condition? Givesketch. 4. Sketch the position of iron filings in a test tube before and afterit has been magnetised. 5. How would you experimentally prove your idea of the molec-ular theory of magnetism ? Give sketch. 6. A magnet is broke
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . the magnets poles. QUESTIONS. 1. Explain what you understand by the molecular theory of mag-netism. Give sketches. 2. Sketch several possible positions of the molecules in an unmag-netised piece of steel. 3. What is meant by a magnetically satisfied condition? Givesketch. 4. Sketch the position of iron filings in a test tube before and afterit has been magnetised. 5. How would you experimentally prove your idea of the molec-ular theory of magnetism ? Give sketch. 6. A magnet is broken into five pieces. Sketch the pieces andtheir resultant polarity in the order in which they were broken. 7. Explain how, by successively breaking up a bar magnet, yousupport the molecular theory of magnetism. Give sketch. 8. According to the molecular theory of magnetism, explain whatyou mean by magnetic saturation. 9. Why is it that hard steel makes a better permanent magnetthan soft iron ? 10. What do you understand by retentiyity ? OUye an example toillustrate your answer, LESSON V. MAGNETIC Magnetic Induction Experiments-Magnetic Induction—Action andKeaction Equal and Opposite—Magnetic Inductive Effect of Likeand Unlike Poles—Reversed Polarity—Consequent Poles—Mag-netic Screens—Questions. 35. Magnetic Induction Experiments.—(1) Separate a piece ofsoft iron bar from a magnet by a piece of paper or wood, as in Fig. the iron into filings; it attracts many more filings whileunder the influence of the bar magnet than it would do is a temporary mag-net made inductivelyby the influence of apermanent magnet. (2) Hold the barmagnet vertically withone end in contact withan end of the the other endof the iron again intofilings. 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 pi
Size: 2464px × 1014px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1901
