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p240f11+Exam+_1+solutions

# p240f11+Exam+_1+solutions - Form listed as VERSION on...

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Version 1 Page 1 Form # listed as VERSION # on bottom of each page Physics 240 First Exam Fall 2011 1. Last Name:____________________ First Name:_____________________ 2. Please circle your discussion instructor and section below: Instructor Time Section David Gidley 9-10 100 David Winn 10-11 200 David Winn 11-noon 300 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 2 points each for a total of 40 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. An electric field points right and is uniform with E = 2.5 N/C. What is the electric flux through the shaded rectangular surface? Take the surface normal to be the one pointing up and to the right. E 5m 4m 3m 10m deep A) zero B) 75 Nm 2 /C C) -100 Nm 2 /C D) 125 Nm 2 /C E) -125 Nm 2 /C 2. A solid, conducting sphere of radius a carries an excess charge of +6 μC. This sphere is located at the center of a hollow, conducting sphere with an inner radius of b and an outer radius of c as shown. The hollow sphere also carries a total excess charge of +6 μC. How much charge is located on the outer surface of the spherical shell? A) +12 μC B) +6 μC C) -6 μC D) -12 μC E) 0 μC
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