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mt2 - UNIVERSITY OF CALIFORNIA College of Engineering...

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UNIVERSITY OF CALIFORNIA College of Engineering Department of Electrical Engineering and Computer Sciences EE 42 / 100 Midterm 2 Spring 2008 Name: SID: Section: Name of student left of you: Name of student right of you: Pr oblem Scor e 1 2 3 4 T otal Check the units of your results. Closed book, closed notes. No calculators. Leave pack, books, and electronic devices (e.g. cell phones) in isle. Take off caps or hats. Copy your answers into marked boxes on exam sheets. Simplify numerical and algebraic results as much as possible. Be kind to the graders and write legibly. No credit for illegible results. No credit for multiple differing answers to the same question. The UC rules on dishonesty apply. 1
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1. [25 points] A capacitor C 1 is used to power a model airplane, represented in the circuit diagram below by resistor R 1 . Initially the capacitor is charged to voltage V 1 . Calculate the fraction r of the initial energy remaining on the capacitor when the current i 1 has decreased to half its initial value.
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