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1Cmid1-solution

# 1Cmid1-solution - Physics 1C First Midterm February 3 2009...

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1 Physics 1C First Midterm February 3, 2009 Name:______________Solutions______________ Student ID:________________________________ This is a closed book test. No calculators. Write in pen. You may use your 3X5 inch index card and nothing else (but your brain). Use this booklet and write your name (in print) on every page in case the pages become separated. Use the space provided to do the problems and if you have to continue it on the back of the page write “continued on back of page” so the grader will know. In problem 3 (short answers) you may only use the space provided between questions. SHOW ALL WORK or you may not get full credit Problem Score Problem 1 (circuit-EMF) 35 points (10 bonus points Problem 2 (Inductance Coax) 25 points Problem 3 (Flux and Forces) 40 points Total

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2 Physics 1C First Midterm 2/3/09 Name______________________________ Problem 1: Given the following circuit: a) (10 points) Suppose that the EMF is a battery turned on at t=0. What is the current that must be delivered by the battery just after turn on and a very long time after turn on? Draw equivalent circuits for each. Solution: Just after the switch is closed the inductor will prevent any current in the end leg and the capacitor will act as a short circuit. In this case the equivalent circuit is a battery in series with R 1 and i ( t = 0) = ! R 1 A long time after the switch is closed the capacitor is charged and no current will flow through it. The inductor will act like a short circuit and again all the current will flow through R 1 and i ( t = ! ) = " R 1
3 Physics 1C Problem 3 continued Name____________________

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1Cmid1-solution - Physics 1C First Midterm February 3 2009...

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