Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 174
concentriccircles, about thewire. This shows thatthe current has amagnetic field, andthat the lines of forceare in concentriccircles. To determine thedirection of these lines, use this rule: Grasp the wire with the right hand, thethumb in the direction of the current, and the fingers will pointout… … Figure 155. — The Field about a WireCarrying an Electric Current. 164 MAGNETIC EFFECT OF CURRENT the 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…
Physics
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