Chapter 17 Current and Resistance Quick Quizzes 1. (d). Negative charges moving in one direction are equivalent to positive charges moving in the opposite direction. Thus, are equivalent to the movement of 5, 3, 4, and 2 charges respectively, giving , , , and abcIIIIdbcIIIdaI<<<. 2. (b). Under steady-state conditions, the current is the same in all parts of the wire. Thus, the drift velocity, given by dnq=vI, is inversely proportional to the cross-sectional area. A3. (c), (d). Neither circuit (a) nor circuit (b) applies a difference in potential across the bulb. Circuit (a) has both lead wires connected to the same battery terminal. Circuit (b) has a low resistance path (a “short”) between the two battery terminals as well as between the bulb terminals. 4.(b). The slope of the line tangent to the curve at a point is the reciprocal of the resistance at
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