. Practical physics. ^ M Fig. 212. Showing dh-ection of motion of an isolated pole near a magnet GENERAL PROPERTIES OF MAGNETS 219 270. Fields of force. The region about a magnet in wliich i^its magnetic forces can be detected is called its field of easiest way of gammg an idea of the way in which the. ?/>/ \ \ \\\\ Fig. 213. Arrangement of ironfilings about a bar mamet Fig. 214. Ideal diagram of fieldof a bar magnet lines of force are arranged in the magnetic iield about anymagnet is to sift iron filings upon a piece of paper placedimmediately over the magnet. Each littl
. Practical physics. ^ M Fig. 212. Showing dh-ection of motion of an isolated pole near a magnet GENERAL PROPERTIES OF MAGNETS 219 270. Fields of force. The region about a magnet in wliich i^its magnetic forces can be detected is called its field of easiest way of gammg an idea of the way in which the. ?/>/ \ \ \\\\ Fig. 213. Arrangement of ironfilings about a bar mamet Fig. 214. Ideal diagram of fieldof a bar magnet lines of force are arranged in the magnetic iield about anymagnet is to sift iron filings upon a piece of paper placedimmediately over the magnet. Each little filing becomes atemporary magnet by induction, and therefore, like the com-pass needle, sets itself in the direction of the line of force atthe point where it is. Fig. ,->--;;:-x,.^ shows how the filings arrange //,--:;-zr. ^Xv themselves about a bar 214 is the correspondmgideal diagram showing the linesof force emerging from the JV^pole and passmg about in curvedpaths to the S pole. It is custom-ary to imagine these lines as re-turning through the magnet fromS to iV in the manner shown, sothat each line is thought of as a closed cmwe. This conven-tion was introduced by Faraday, and has been found ofgreat assistance in correlating the facts of magnetism. A magnetic field of unit s
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
