PH 102 Midterm: ph102_S15_exam2
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Instructions: solve three of the four problems below, all problems have equal weight. Do your work on separate sheets: you are allowed 1 sheet of standard 8. 5 11 in paper and a calculator. (cid:3) 1. Symbolic solution (a) consider the bridge arrangement of resistors in fig. This is an example of an arrangement which cannot be reduced to a single equivalent using only our rules for series and parallel resistance. In this circuit, what is the current through the central (horizontal) resistor? (b) in fig. 1b, two resistors have been swapped, and the central resistor removed. What voltage does the voltmeter read in this case, in terms of the source voltage vs? (you do not need to know r; think about proportions. ) (c) for the circuit in fig. A heater coil uses a 3 m length of wire which is 1 mm diameter (approximately 18 gauge).
