Electricity and magnetism : an elementary text-book, theoretical and practical (1920)
Glazebrook, Richard, Sir, 1854-1935 · Cambridge : The University press · leaf 127
Fig. 73. The points P, P in Figures 72 and 74 are points at whichthe force due to the magnet exactly balances that due to theearth. They are thus points of zero force. The lines of force due to a combination of magnets can betraced in a similar manner. 71] MAGNETIC ATTRACTION AND REPULSION 117 The… … Fig. 74. them is placed a thin plate of glass, and on the glass a sheetof paper. Iron filings are dusted on to the paper through asieve, and the glass plate is tapped so as to aid the filings totake up their positions under the magnetic forces. Figures^ 75a to e shew the forms of the lines of force…
Electricity · Magnetism
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