PHYSICS 240 Final--Winter 2000-1

PHYSICS 240 Final--Winter 2000-1 - Physics240 Final Exam...

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Physics 240 Final Exam April 17,2000 Your printed name Your Signature Instructions: The exam is 120 minutes long. There are 40 questions, check that you have all pages. You may use one 3" by 5" card of notes and a calculator. No other notes or books are allowed. Notebook PC's, PDA's, or calculators with extensive text displays are nor allowed. Make sure you correctly copy your choices to the answer sheet. Make sure you put the exam version ( t ) and your section on the answer sheet. Section Time Instructor 004 11 Merlin 005 12 006 | Brctz 0L4 2 Brctz 015 3 Bretz 016 4 Yokoyama 018 8 Yokovama 022 g 023 10 Roe 024 025 I 026 L2 Coulomb's law constant Charge on electron Mass of electron Mass of proton Permittivity of free space Permeability of free space Speed of light in vacuum Room 224Dennison 224 Dennison 222WestHall 216 Dennison 414 Dennison 221 Dennison k = g.ggg x 10e N-m2/c' e = -1.6 x 10-'e C fiIe 9.11 * 10-31 kg mp= 7.67 10-27 eo 8.85 19-tz C2A.{-m2 $o= 4n 10-7 T-m/A c 3.00 10E m/s Prefixes:Mmega=106,kkilo-l03,mmilli=10-3,pmicro=10-6,nnano=10-e,ppico=10-12 Useful constants:
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/6 Physics 240 Final Exam 1. A small object has charge Q. Charge q is removed from it and placed on a second initially uncharged small object. The two objects are placed 1 m apart. For the force that each object exerts on the other to be a maximum q should be: 2. Two point charges, Q1 and gz, dre placed a distance r apart. The electric field is zero at a point P between the charges on the line segment connecting them. We conclude that: A) qr and qz must have opposite signs and may have different magnitudes B) P must be midway between gr and gz C) qr andq2must have the same magnitude and sign D) qr andq2must have equal magnitudes and opposite signs E) qr andq2must have the same sign but may have different magnitudes 3. The magnitude of the force on a0.02 C point charge due to an electric field of 4000 N/C is: 8x10-3 N 2x1011N 8x10-5 N 80N 0.08 N 4. A point particle with charge q is at the center of a gaussian surface in the form of a cube. The electric flux through any one face of the cube is: A) ql4nes B) q/6es C) q/ee D) q/8es E) qlaes A) Q/2 B) Q/4 C)Q D)0 E) 2Q A) B) c) D) E) April 17,2000 Page 1
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161 Physics 240 Final Exam 5. A solid insulating sphere of radius R contains a uniform volume distribution of positive charge. Which of the graphs below correctly gives the magnitude E of the electric field as a function of r? 'l- '1,,\ I l-, | , v , , FRR lllltt 'lA lI, v,tL FH tvv A) I. B) tr. c) r. D) rv. E) V. ' 6: Charge is distributed uniformly on the surface of a large flat plate. The electric field 2 cm from the plate is 30 N/C. The electric field 4 cm from the plate is: A) 30 N/C B) 80 N/C c) 7.s N/C D) 15 N/C E) 120 N/C April17,2000 Page2
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t70 Physics 240 Final Exam 7. Two conducting spheres, one having twice the diameter of the other, are separated by a distance large compared to their diameters. The smaller sphere (1) has charge q and the larger sphere (2) is uncharged. If the spheres are connected by a long thin wire: oI fri'.
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This test prep was uploaded on 04/01/2008 for the course PHYSICS 240 taught by Professor Davewinn during the Fall '08 term at University of Michigan.

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PHYSICS 240 Final--Winter 2000-1 - Physics240 Final Exam...

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