Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 65
Let us first consider the forces tending to bring back again a horizon- 46 Electricity. [Book I. tally suspended magnetic needle displaced from the meridian.Using absolute units, assume m to be the magnetic strength ofeach pole of the magnet, and H the horizontal componentof the earths magnetic… … couple, tending to twist the magnet back to its position ofrest, is 2Hm x PM where PM is the arm of either force. This maybe written Hm.PP x ~ when _- depends only on the angle PGM, through which the magnet is deflected. Thequantity mxPP is usually called the Magnetic Moment of Chap. IV.]…
Electricity
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