 Why is less force required to pull a small iron rod away from the poles of a powerful horse-shoe magnet than would be required to pull a thick bar of iron away from the poles of the same magnet ? 4.  Magnetism and electricity - Page 176by Richard Wormell - 1882 - 260 pagesFull view - About this book
 | Great Britain. Education Department. Department of Science and Art - 1877 - 562 pages
...what experiments could you ascertain whether a sewing-needle is or is not slightly magnetized ? 2. What is the magnetic condition of a bar of soft iron...knitting-needle is broken into three equal pieces. Would all the three pieces be equally magnetized ? If not, how do you suppose they would differ and why ? Frictional... | |
 | Adolphe Ganot - 1881 - 658 pages
...what experiments could you ascertain whether a sewing needle is or is not slightly magnetised ? 15. Why is less force required to pull a small iron rod...bar of iron away from the poles of the same magnet ? 16. Give your reasons for supposing that there is no such phenomenon as magnetic conduction. 17-... | |
 | Arthur William Poyser - 1889 - 264 pages
...rods, from below, one pole of a strong bar magnet, the rods separate from each other. Explain this. 13. Why is less force required to pull a small iron rod...bar of iron away from the poles of the same magnet ? Difficulty of Magnetisation of Steel.— Exp. 32. Take a steel knitting-needle and a piece of soft... | |
 | John Duncan Quackenbos - 1891 - 572 pages
...How does it account for the attraction of iron ? How, for the strengthening effect of the armature ? Why is less force required to pull a small iron rod away from the poles of a powerful horseshoe-magnet than to detach a thick piece of iron ? Describe the rolling armature ; the magnetic... | |
 | Mark Robinson Wright - 1892 - 262 pages
...which it would be held if it were in contact with only one pole of the same magnet. Why is this ? 5. Why is less force required to pull a small iron rod...required to pull a thick bar of iron away from the same magnet ? , 6. You have three equal bar magnets without keepers. How would you arrange them, so... | |
 | Arthur William Poyser - 1903 - 398 pages
...rods, from below, one pole of a strong bar magnet, the rods separate from each other. Explain this. 13. Why is less force required to pull a small iron rod...bar of iron away from the poles of the same magnet ? Difficulty of Magnetisation of Steel.— Exp. 32. Take a steel knitting-needle and a piece of soft... | |
 | Adolphe Ganot - 1905 - 802 pages
...magnet produces at the centre of the circle a magnetic field less strong than that of the earth. 19. Why is less force required to pull a small iron rod...required to pull a thick bar of iron away from the pole of the same magnet ? 20. Give your reasons for supposing that there is no such phenomenon as magnetic... | |
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