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Practice Exam _1 form1

# Practice Exam _1 form1 - Form 1 Physics 240 First Practice...

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Form 1 Physics 240 First Practice Exam Winter 2007 1. Last Name:___________________ First Name:_____________________ 2. Please circle your discussion instructor and section below: Instructor Time Section Instructor Time Section Krisch 10-11 010 Lubensky 8-9 007 Krisch 11-12 011 Lubensky 9-10 008 Krisch 12-1 012 Lubensky 10-11 009 Chupp 12-1 013 Chupp 1-2 014 Chupp 2-3 015 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 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

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2. In the above problem how much work is required of an external force to bring an electron in from infinity to the origin? a) 0 b) 1.4 x 10 -15 J c) - 1.4 x 10 -15 J d) 2.9 x 10 -15 J e) - 2.9 x 10 -15 J 1. Four point charges, either + or - 1 μC (10 -6 C) as shown, are positioned on the x and y axes each one meter from the origin. What is the magnitude of the electric field at the origin? a) 0 b) 9.0 x 10 3 N/C c) 1.8 x 10 4 N/C d) 2.5 x 10 4 N/C e) 3.6 x 10 4 N/C + + - - 1 m + + - - 1 m
4. Three concentric, thin, uniformly charged spherical shells (A, B, and C) have radii of 1m, 2m, and 3m respectively. At the center of the shells is a +12 μC point charge. The shells have charges of Q A =-14 μC, Q B =-6 μC, and Q C =-14 μC. (1μC = 10 -6 C) Rank the magnitude of E just above the outer surface of each shell.

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