exam1version2with solutions

exam1version2with solutions - 1 Exam I Version 0002 Physics...

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Vers.0002 1 Exam I, Version 0002 - Physics 1120 - Fall, 2008 NAME (print please)__________________________________________ Student ID #__________________________________________________ TA’s Name (Circle one! ): Carr, Chen, Gaebler, Kalkwarf, Meyer, Morrison, Xie Starting time of your Tues recitation (write time in box: 9am, noon, 1pm, etc) Please do not open the exam until you are told to. Your exam should have 11 pages, numbered 1 thru 11. This exam consists of 16 multiple-choice questions worth 80 points total (i.e., 5 points for each question), and two multipart long-answer questions worth 20 points total. Fill in the bubble sheet with a #2 pencil. PLEASE follow all directions carefully – if you don’t, we may not be able to identify your exam (which would be a disaster for you!) Place a check in each box on the left as you complete the instructions. Circle your TA's name. Print and bubble in your name on the bubble sheet. Print and bubble in your student Identification Number. Print and bubble in your Exam version, 0001 or 0002, in the upper left of your bubble sheet in the area marked 1234. Please leave the areas labeled Code and Date blank Erase mistakes as thoroughly as possible. Ask for a fresh bubble sheet if you fear you cannot thoroughly erase mistakes. As you take the exam, circle the correct answers on your exam as well as mark them on the bubble sheet, so we can grade the exam, if your bubble sheet is lost. At the end of the exam, check that you have filled in the first 18 questions on the bubble sheet, with only one bubble filled in for each question. I have read and followed the instructions above. Signature______________________________________________ Possibly useful information: eC 16 10 19 ., ε o SI units) 885 10 12 . ( , k = 1/(4 πε o )
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Vers.0002 2 1. A small negative test charge - q is released from rest near a larger positive fixed charge + Q . Initially, as – q starts to move towards + Q , the magnitude of –q ’s acceleration A) increases with time B) decreases with time C) stays the same (but non-zero) as time passes D) stays the same, exactly zero, as time passes Answers: A). The distance between –q and +Q decreases with time, and the force and hence acceleration must increase with time. 2. An electric dipole is placed in an electric field as shown to the right. At the instant shown, what direction is the net force on the dipole? A) up B) right C) down D) left E) The force is exactly zero Answers: D). The E field is stronger on the left side of the dipole than on the right side, judging from the field line density. Therefore, the force on the negative charge of the dipole which points to the left is stronger that on the positive charge of the dipole. 3. Two large, parallel planes of charge made from non- conducting material are shown edge-on. The left plane has positive charge density σ , and the right plane has positive charge density 2 . The planes are so large that they can be considered infinite in extent. What is the magnitude of the electric field in region III, which lies to the right of both planes?
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This note was uploaded on 10/08/2008 for the course PHYS 1120 taught by Professor Rogers during the Fall '08 term at Colorado.

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exam1version2with solutions - 1 Exam I Version 0002 Physics...

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