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# pexam2 - Physics 21 Fall 2007 1 2 3 4 5 Total Name...

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Physics 21 Fall, 2007 Practice Hour Exam #2 1 2 3 4 5 Total Name: Recitation Time Recitation Leader This exam is closed notes and closed book. You must show enough work on all problems to convince the grader you understand how to solve the problem. You may use a calculator. Give units. There is an equation sheet on the last page. All problems count 20 points. Problem 1. For the following circuit, R =8 . 0Ω , L =2 . 0 mH, and C = 500 μ F, and the frequency is 700 Hz. R L C V rms (a) Write the loop equation for this circuit. (b) Draw a phasor diagram for the voltages in this circuit. What is the rms value of the current if V rms =6V? (c) What is the phase relationship between the cur- rent and the applied ac voltage? In other words, does the current lag or lead the applied voltage? by how much? Problem 2. A single rectangular loop of wire with the dimensions shown in the ±gure is inside a region of magnetic ±eld B ( t ) directed into the page. The magni- tude B ( t ) of the ±eld is given by B ( t )=0 . 02 t T, where t is in seconds.

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pexam2 - Physics 21 Fall 2007 1 2 3 4 5 Total Name...

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