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Fall 2010 Exam 2 Solutions

# Fall 2010 Exam 2 Solutions - Physics 21 Fall 2010 Solution...

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Physics 21 Fall, 2010 Solution to Hour Exam #2 If you want to discuss the grading, you must speak with the grader by Dec. 8. 1: Beels 2: Jones 3: Faust 4: Beels 5: Glueckstein Problem 1. For the following circuit: (a) (8 pts.) If R = 22 . 0 Ω, L = 25 . 0 mH, C = 10 . 0 µ F, and ω = 800 . 0 rad / s, draw a phasor di- agram that is approximately to scale. Include a phasor for the ac voltage V , and give the length of each phasor. Draw a mark on your diagram to indicate the phase angle φ . (b) (3 pts.) Evaluate the peak value of the current I if the peak voltage supplied by the power supply is 8 . 00 V. Show all work. (c) (3 pts.) Evaluate the phase angle φ . Does the voltage lead or lag the current? (d) (3 pts.) What is the average power delivered to the circuit by the power supply? (e) (3 pts.) What is the time interval between a max- imum in voltage across the inductor and the next maximum in voltage across the power supply?

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Problem 2. A small circular wire loop is inside a larger loop that is connected to the circuit as shown.
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Fall 2010 Exam 2 Solutions - Physics 21 Fall 2010 Solution...

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