Physics126.Exam1 Winter08

Physics126.Exam1 Winter08 - University of Michigan Physics...

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University of Michigan Physics 126 Fall 2005 Exam 2 Form 1 Instructions: Please keep booklet closed until instructed. You may use notes on two sides of a 3x5 index card, Answer questions on the scantron sheet by blackening the dot The time for the exam is 90 minutes. Useful Physical Constants: 19 12 2 2 0 92 2 0 2 1.602 10 C 8.85 10 C /(N m ) 1/(4 ) 8.99 10 N m /C 9.8 m/s e k g ε πε == × =
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Page 2 1. Two charges Q 1 and Q 2 are 8.0 cm apart. Charge Q 1 = 5.0 nC and Q 2 = –5.0 nC. The magnitude of the electric field at point P, 3.0 cm from the midpoint of the line joining Q 1 and Q 2 , is A) 3.6 × 10 6 N/C B) 0.29 kN/C C) 2.9 × 10 5 N/C D) 3.6 × 10 5 N/C E) 2.9 × 10 4 N/C 2. The diagram shows the electric field lines in a region of space containing two small charged spheres (Y and Z). Then: A) Y is negative and Z is positive B) the magnitude of the electric field is the same everywhere C) the electric field is strongest midway between Y and Z D) a small negatively charged body placed at X would be pushed to the right E) Y and Z must have the same sign 3. Two parallel horizontal plates are spaced 0.40 cm apart in air. You introduce an oil droplet of mass 4.9 × 10 -17 kg between the plates. If the droplet carries two electronic charges and if there were no air buoyancy, you could hold the droplet motionless between the plates if you kept the potential difference between them at A) 0.12 kV B) 60 V C) 12 V D) 6.0 V E) 3.0 V
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Page 3 4. A 120-V power line is protected by a 15-A fuse. What is the maximum number of "120 V, 500 W" light bulbs that can be operated in parallel at full brightness from this line?
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This test prep was uploaded on 04/06/2008 for the course PHYSICS 126 taught by Professor Amidei during the Winter '08 term at University of Michigan.

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Physics126.Exam1 Winter08 - University of Michigan Physics...

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