Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 417
the statement thatthe lines of magnetic force producedby a current in a straight conductor,so arranged that the other portionsof the circuit are at a great distance,are circles in a plane at right anglesto the conductor, their direction beingrelated to that of the current as thedirection of… … Fig. 248. CURRENT IN A CIRCULAR COIL. 407 The existence of such a field may be shown experimen-tally by passing a stout copper wire through a piece of card-board and scattering iron filings over the latter. If thecard be gently tapped while a strong current is sent throughthe wire, the filings may…
Physics
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