. The Ontario high school physics. en con-tinue through the macjnet to the>- i\^-pole again (Fig. 453). Thus each line of force is a closed curve. Itis evident, also, that if we could Fig. 453.—The lines of force run from i , i -jir i ^ j i the iv-poip through the surrounding cietach a iV-pole irom a magnet and medium to the 5-pole, and then i •■ ■%• on i a through the magnet back to the place it on any luie oi lorce, at A starting point. p • i •• i i i tor instance, it would move alongthat line of foice until it wouldcome to the >Sf-pole. Great use is made of theconception of lines of f
. The Ontario high school physics. en con-tinue through the macjnet to the>- i\^-pole again (Fig. 453). Thus each line of force is a closed curve. Itis evident, also, that if we could Fig. 453.—The lines of force run from i , i -jir i ^ j i the iv-poip through the surrounding cietach a iV-pole irom a magnet and medium to the 5-pole, and then i •■ ■%• on i a through the magnet back to the place it on any luie oi lorce, at A starting point. p • i •• i i i tor instance, it would move alongthat line of foice until it wouldcome to the >Sf-pole. Great use is made of theconception of lines of force incomputations in magnetism andelectricity, for example, in design-ing dynamos. This method ofdealing with the subject was in-troduced by Faraday about 1880. 431. Magnetic Shielding. Mostsubstances when placed in amagnetic field make no appre-ciable change in the force, butthere is one pronounced exceptionto this, namely iron. Place a bar-magnet with onepole about 10 cm. from a large compass needle (Fig. 454),. Michael Faraday (1791-1867). Bornand lived in London. The greatest otexperimental scientists. His discoveriesform the basis of all our applicationsof electricity.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectphysics
