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The Study of Elementary Electricity and Magnetism
Thomas M. St. John
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Every magnet has a certain magnetic field, with its lines of force passing through the surrounding air in certain definite positions. As soon, however, as a piece of iron or another magnet is brought within the field, the original position of the lines of force is changed. This has to be considered in the construction of electrical machinery.
EXPERIMENT 32. To study the magnetic field of a bar magnet.
Apparatus. A sheet of stiff paper; iron filings, I F; bar magnet, B M (No. 21); a sifter for the filings (No. 24); (See Apparatus Book, §48, 49, 50, for home-made sifters.)
63. Directions. (A) Place B M upon the table, and lay the paper over it.
(B) With the sifter sprinkle some filings upon the paper directly[25] over B M, then tap the paper gently, to assist the particles to take final positions. Study the results.
64. Magnetic Figures; Lines of Magnetic Forc. . . Read More
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