HomeworkAssignment(9-10)-02-08-08 - Lehigh University...

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Lehigh University February 8, 2008 Physics 21, Spring 2008 Home Work Assignment (9-10) Note: Solutions to the problems must be submitted on WileyPLUS ( ). HW-9 due February 13 9-1. (HRW 27-18) Figure 27-35 shows a resistor of resistance connected to an ideal battery of emf by means of two copper wires. Each wire has length 20.0 cm and radius 1.00 mm. In dealing with such circuits in this chapter, we generally neglect the potential differences along the wires and the transfer of energy to thermal energy in them. Check the validity of this neglect for the circuit of Fig. 27-35 : What is the potential difference across (a) the resistor and (b) each of the two sections of wire? At what rate is energy lost to thermal energy in (c) the resistor and (d) each section of wire? 9-2. (HRW 27-22) A solar cell generates a potential difference of 0.10 V when a 500 resistor is connected across it, and a potential difference of 0.15 V when a 1000 resistor is substituted. What are the (a) internal resistance and (b) emf of the solar cell? (c) The area of the cell is 5.0 cm
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