Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 175
needle will tend to turn at right angles to the wire. (Figure157.) The following rule can be used to tell which direction the needle will turn:Extend the fingers ofthe right hand along thewire with the wire be-tween the palm of thehand and the needle,and the thumb willpoint the direction theN-pole… … Figure 156. — Magnetic Needles Show Di-rection of Field about a Wire Carryingan Electric Current. tf Current Figure 157. Needle Magnetic Needle Turns with the Lines of Force. when a current is passed through the helix, it makes theiron a magnet with a north and a south pole. (Figure 158.) The coil…
Physics
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