211_Final_Exam_Fall_08-09

# 211_Final_Exam_Fall_08-09 - PHYSICS 211 Final EXAM FALL...

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PHYSICS 211 Final EXAM FALL 2008-09 TIME: 120 minutes January 27, 2009 DO NOT OPEN THIS EXAM BEFORE YOU ARE TOLD TO BEGIN NAME________________________________________________ ID Number ________________________ Useful information ε 0 =8.85x10 -12 C 2 /N.m 2 . μ 0 =4p x 10 -7 Tm/A. q = 1.6 × 10 - 19 C m e = 9.1x10 -31 kg. m p = 1.67×10 -27 kg. k e =8.9875x10 9 Nm 2 /C 2 The solution for the differential equation of the form dy/dt + ay = b is y =( b/a) (1-exp(- at )) Grading A B TOTAL Part A: Multiple choice questions (20) each question has 2 points Score:________ Check if solution is continued on the back. 1

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If a = 3.0 mm, b = 4.0 mm, Q1 = 60 nC, Q2 = –80 nC, and q = 36 nC in the figure, what is the magnitude of the total electric force on q? a. 5.0 N b. 4.4 N c. 3.8 N d. 5.7 N e. 0.60 N 2. A positive point charge q is placed off center inside an uncharged metal sphere insulated from the ground as shown. Where is the induced charge density greatest in magnitude and what is its sign? a. A; negative. b. A; positive. c. B; negative. d. B; positive. e. C; negative. 3 . The electric potential inside a charged solid spherical conductor in equilibrium a. is always zero. b. is constant and equal to its value at the surface. c. decreases from its value at the surface to a value of zero at the center. d. increases from its value at the surface to a value at the center that is a multiple of the potential at the surface. e.
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211_Final_Exam_Fall_08-09 - PHYSICS 211 Final EXAM FALL...

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