Fall 2009 Exam 2 Solutions

# Fall 2009 Exam 2 Solutions - Physics 21 Fall 2009 Solution...

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Unformatted text preview: Physics 21 Fall, 2009 Solution to Hour Exam #2 If you want to discuss the grading, you must speak with the grader by Nov. 20. 1: Beels 2: Malenda 3: Belony 4 and 5: Drake Problem 1. For the following circuit (a) (5 pts.) Write the loop equation for this circuit. (b) (5 pts.) If R = 250 Ω , L = 800 mH, C = 8 . 00 μ F, and ω = 500 rad / s, draw a phasor diagram for this circuit that is approximately to scale. In- clude 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. (c) (5 pts.) For the parameters given in part (c), find the phase angle φ and the average power delivered to the circuit by the power supply. (d) (5 pts.) If the voltage supplied by the power sup- ply is constant, for what frequency ω will the cur- rent in the circuit be the maximum? Problem 2. A long, straight wire lies along the y axis and carries a current 4.00 A in the + y direction. In addition to the magnetic field due to the current in...
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Fall 2009 Exam 2 Solutions - Physics 21 Fall 2009 Solution...

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