Midterm2_9HD_2009

# Midterm2_9HD_2009 - Midterm#2 Physics 9HD Fall 2009 Nov 23...

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1 Midterm #2 Physics 9HD, Fall 2009 Nov. 23, 2009 NAME_______________________________________________________________________ You are permitted to use one 8 /1/2” x 11” sheet of paper with formulas, and your calculator. MAXIMUM SCORE IS 100 POINTS. THE EXAM HAS 4 PROBLEMS ON 2 PAGES. SHOW ALL YOUR WORK. Please hand in your copy of the test with your work, so that I can see any additions which you have made to the diagrams (e.g., assignment of currents, nodes, and loops for Problem 4.) ______________________________________________________________________________ 1. (10 points) (a) Suppose you are given a black box, which you are told contains a circuit with only batteries and resistors. You can make electrical connections to two electrical terminals on the box, which are connected to the circuit. Using the two terminals, explain what measurements you would make in order to determine the Thévenin equivalent voltage, E eq , and Thévenin equivalent resistance, R eq , of the components in the box. (b) Now connect a resistor R across the two terminals of the black box. What is the power dissipated in R? 2. (50 points) (a) An infinitely long straight wire of negligible cross-sectional area is at rest on the x-axis and has a uniform linear charge density λ o (in esu/cm) in the inertial frame F’. The frame F’ (and the wire) move

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