Snow, Benjamin Warner, 1860- · Madison, Wis. · leaf 544
w in the direction in which the current is Mowing, then thelines of force exist about the wire in the direction in which youwould have to turn the screw. Another rule for the same pur-pose is found wry serviceable liy many: If you look along theconductor in the direction in which the current is… … Fig. 270. The circular magnetic field abouta current, as mapped by iron filings. O40 ELECTROMAGNETISM. magnetic field about a current is to grasp the conductor Avith theright hand, the thumb extended in the direction in which thecurrent is floAving, in -which case the fingers are then wrappedabout…
Physics
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