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Phys240_2006_PracExam1

# Phys240_2006_PracExam1 - Physics 240 First Practice Exam...

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Physics 240 First Practice Exam Fall 2006 1. Please print your name: __________________________________________________ Last First 2. Circle your discussion instructor and section: Instructor Time Section Skalsey 8-9 004 Skalsey 9-10 005 Skalsey 10-11 006 Chapman 9-10 007 Chapman 10-11 008 Chapman 11-12 009 Lubensky 10-11 010 Lubensky 11-12 012 Lubensky 12-1 013 Bobkov 1-2 014 Instructor Time Section Bobkov 2-3 015 Bobkov 3-4 016 Bobkov 5-6 017 Bobkov 6-7 018 Bobkov 7-8 019 Savit 12-1 023 Savit 1-2 024 Savit 2-3 025 Skalsey 5-6 026 3. Fill in your name, student ID number, section number, and the exam version (form) number on the scantron sheets. 4. There are twenty multiple choice questions, worth 5 points each, for a total of 100 points. 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. 5. At the end of the exam, hand in your scantron sheet AND your exam copy. 6. The exam is closed book. You may use a calculator and one 3”x5” card of notes. 7. This is a 90 minute exam. k = π ε 0 = 9 × 10 9 N m 2 2 0 = 8.85 × 10 12 C 2 m e = 1.6 × 10 19 C 1 eV = 1.6 × 10 19 J

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1. A positive charge + Q is uniformly distributed on the bottom half of a rod and a negative charge Q is uniformly distributed on the upper half. What is the direction of the electric field at point P, on the perpendicular bisector of the rod? a) b) c) d) e) 2. A 5.0 µ C charge is placed at the center of a cube. The electric flux in Nm 2 /C through one side of the of the cube is: a) 0 b) 71 10 4 . × c) 94 10 4 . × d) 14 10 5 . × e) 16 10 5 . × 3. An electron is accelerated from rest through a potential difference of V . The electron’s final speed is proportional to: a) V b) V 2 c) 1 V d) V e) 1 V -Q +Q P
4. The diagram shows the electric field lines due to two horizontal charged metal plates. We conclude that: a) the upper plate is positive and the lower plate is negative b) a positive charge at X would experience the same force if it were placed at Y c)

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Phys240_2006_PracExam1 - Physics 240 First Practice Exam...

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