midterm+3+OFFICIAL+practice+exam

# midterm+3+OFFICIAL+practice+exam - Form listed as VERSION...

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Version 1 Page 1 Form # listed as VERSION # on bottom of each page Physics 240 Third Exam Winter 2011 1. Last Name:____________________ First Name:_____________________ 2. Please circle your discussion instructor and section below: Instructor Time Section David Gidley 9-10 100/101 David Winn 10-11 200/201 3. Fill in your name, 8 digit student ID number, discussion section number, and the exam FORM number on the scantron sheet 4. There are 20 multiple choice problems worth 5 points each for a total of 100 points. Choose the one best answer and transfer it to the scantron sheet. You must mark the correct answer on the scantron sheet to get credit for the problem. There is no penalty for guessing, so be sure to enter an answer for every question even if it is just a best guess. 5. At the end of the exam hand in both your scantron and exam booklet in separate piles set up by the proctors. 6. This is a closed book, 90 minute exam. Turn off and put away all electronic devices. You may use a calculator and one 3”x5” note card or equivalent. k = 1/4πε 0 =9x10 9 Nm 2 /C 2 ε 0 = 8.85x10 -12 C 2 /Nm 2 e = 1.6x10 -19 C 1 eV= 1.6x10 -19 J μ = micro =10 -6 g = 9.8 m/s 2 m e = 9.1 x 10 -31 kg M P =1.67 x 10 -27 kg

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Version 1 Page 2 1. Radio receivers are usually tuned by adjusting the capacitor of an LC circuit. If C = C 1 for a frequency of 600 kHz, then for a frequency of 1200 kHz one must adjust C to: A) C 1 /2 B) C 1 /4 C) 2 C 1 D) 4 C 1 E) 1 2 C 2. The main reason that alternating current (AC) replaced direct current (DC) in general use of electrical power is: A) AC minimizes eddy current heating effects B) the public trusted Thomas Edison more than they did George Westinghouse C) AC currents do not have unwanted stray mutual inductance problems that occur with dc currents D) AC voltages may be conveniently transformed up or down E) electric motors do not work on DC
Version 1 Page 3 3. The resistance in the rail gun pictured below is 10 Ohms, the length of the bar is 20 cm, the mass of the bar is 2 kg, and the voltage is 120 Volts. If a 2 Tesla magnetic field is directed out of the page then what is the terminal velocity of the bar? A) 120 m/s B) There is no upper limit to the rods velocity C) 420 m/s D) 20 m/s E) 300 m/s

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Version 1 Page 4 4. Which of the following is true for the solenoid in the diagram?
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## This note was uploaded on 01/30/2012 for the course PHYS 240 taught by Professor Winn during the Fall '11 term at University of Michigan.

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midterm+3+OFFICIAL+practice+exam - Form listed as VERSION...

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