WMU PHYS 1150 - Exam (2 pages)

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Western Michigan University
Course:
Phys 1150 - General Physics II
General Physics II Documents

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X1 4a 115 PHYS 115 4 Kaldon 26364 WMU Spring 2005 Exam 1A 100 000 points Name S O L U T I O N Book Title Rev 02 02 05 We A5 State Any Assumptions You Need To Make Show All Work Circle Any Final Answers Use Your Time Wisely Work on What You Can Be Sure to Write Down Equations Short Answers Should Be Short Feel Free to Ask Any Questions Physics 115 Exam 1 Spring 2004 Page 2 This Story Has To Have a Point 50 000 points 1 Three identical 15 0 nC 15 0 10 9 C charges q1 q2 and q3 are equally r spaced apart by a distance of 5 00 cm each Find the total electric force FE acting on q2 in the center r r r By Symmetry FE F12 F32 0 EXAM 1 FORM A PHYS 115 KALDON 4 r b Find the total electric field E acting on q2 in the center from the other two charges r r r By Symmetry E E1 E3 0 SPRING 2005 WMU c Find the total electric potential V acting on q2 in the center from the other two charges d 5 00cm 0 0500m kq V r kq kq 2 kq V V1 V3 d d d 2 2 8 988 109 N m C 2 15 0 10 9 C 5393volts 0 0500m c Presidential Inaugurations State of the Union Speech Big Winter Storms and Super Bowl Sunday First 115 Physics exam with cookies Priceless And It s Only Just February b hc g h d Find the number of electrons added or subtracted to make q2 Q Ne q Ne N 15 0 10 9 C 93 630 000 000 electrons subtracted 1602 10 19 C Physics 115 Exam 1 Spring 2004 Page 3 e An electron is located a long way 1 00 meter to the right from q2 in the center from the other two charges Find the initial magnitude and direction of the electron s acceleration me 9 11 10 31 kg FE kq1q2 r2 8 988 109 c N m2 C2 10 C h hb3gc15 0 10 Chc1602 mg b100 9 Physics 115 Exam 1 Spring 2004 Page 4 Q V Q CV 5531 10 11 F 25 000volts 1383 10 6 C 1 383 000 pC C c hb g 19 2 d Use Gauss Law to find the magnitude of the electric field between the plates Because of the dielectric silicone oil between the plates you ll have to multiply e0 by k in the Gauss Law equation 6 480 10 17 N FE ma a FE 6 480 10 17 N 7 113 1013 m s2 9 11 10 31 kg m Note You do NOT



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