f the same wire is passed vertically through a piece ofcardboard and fine iron filings sifted on the card, thefilings arrange themselves inwhirls around the wire, and asmall pocket compass placedanywhere in the field willalways lie tangent to the linesof force (Fig. 100). If thecurrent be reversed,… … Electro-Dynamics. 131 If several turns be made in the conductor, the resultwill be as indicated in Fig. 102, and the lines of force willassume the same form and direction as in an ordinary barmagnet.
Physics
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