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Unformatted text preview: Physics 21 Fall, 2008 Solution to Hour Exam #2 The graders for the problems were: 1 Belony, 2 Lyu, 3 Poplawsky, 4 Smith, 5 Kanofsky For questions about grading, see the grader by Nov. 21. Problem 1. For the following circuit (a) (5 pts.) Write the loop equation for this circuit. (b) (5 pts.) Write the expression for the phase an- gle of this circuit in terms of R , L , C , and the frequency of the ac power supply. (c) (5 pts.) If R = 12 . 0 , L = 90 . 0 mH, C = 50 . F, and = 120 rad / s, draw a phasor diagram for this circuit that is approximately to scale. Include a phasor for the ac voltage V , and give the length of each phasor. Find the peak value of the current I if the peak voltage supplied by the power supply is 8 . 00 V. (d) (5 pts.) For the parameters given in part (c), find the phase angle and the average power delivered to the circuit by the power supply. Problem 2. A long wire lies in the xy plane and car- ries a 3.0 A current as shown in the diagram. The thick segment centered at the origin has a length 3.0 mm and makes an angle of 30 with the x axis....
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- Fall '08