Phys 115 Exam#4 - þ7#Ð##V#°#V#°###§#6#§Ç#f#ª#ª#ª#h#ªñ#R#«C##«Å#«Å#«Ù#x#¨#¬Q#¬q#¬#¬±#x##f#Physics 115B(Winter

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Unformatted text preview: þ7########(################Ð##»)#######(##########################V##°##V##°##§# ####§#####§¡#6##§Ç#f##ª¡####ª¡####ª¡#h##ªñ#R##«C#¡##«Å####«Å####«Ù#x##¨-#\##¬Q# ##¬q####¬¡#*##¬±#x##§+#f# ######################################################################Physics 115B (Winter 1992)Exam #1Name Seat Number Signature Student Number Print your name, sign your name, and provide your student number and seat number Legibly in the spaces provided above. In addition, it is VERY IMPORTANT that you print your name at the top of every exam page, in the space provided. This should be the first thing you do when you are told to open your exam. This exam consists of FOUR questions, each consisting of several parts of varying difficulty. If you cannot do one part, move on to the next. Partial credit will be given for all parts of this exam. To get full credit, you must show clearly how you obtained your answers. Please circle your answers and always state the units if appropriate. For numerical answers, 2 significant figures (e.g., 1.2 Coulombs, 1300 m) will be sufficient, unless stated otherwise. If you need more space, use the back of the sheet. DO NOT USE the back of the previous sheet. If you are confused about a question, PLEASE ASK for an explanation. This is a closed book exam but you may have on your desk one sheet of paper, on which you have written your name and constants and equations of your choice. You may also use a calculator. Do not open the exam before the 8:30 bell. #Stop working at the 9:30 bell. #Completed exams will not be accepted after 9:35. 1. : [15 points] 2. : [30 points] 3. : [30 points] 4. : [25 points] Total : [100 points] 1. [20 points total] A test charge of magnitude Qt = +1 mC (note: 1 mC = 10-6 C) is placed near three fixed charges, Q1, Q2, and Q3, as shown below.#A. [10 points] Find the electric field (magnitude and direction) at the position of the test charge due to the three fixed charges, Q1, Q2, and Q3.B. [5 points] How would the electric field found in part A change if the +1 mC test charge were replaced by a -2 mC test charge? Explain.C. [5 points] Find the force (magnitude and direction) that would be exerted on this -2 mC test charge by the three fixed charges, Q1, Q2, and Q3. 2. [20 points] The diagram below shows a stack of six identical bricks that lie upon the ground. #A. [5 pts] In the space below, draw a free-body diagram for the top brick (#1). Label each of the forces to identify: ¥ the type of force (e.g., normal, tension, electric, etc.), #¥ the object exerting the force, and #¥ the object on which the force is exerted. B. [5 pts] In the space below, draw a free-body diagram for brick #2. Again, label each of the forces to identify: ¥ the type of force (e.g., normal, tension, electric, etc.), #¥ the object exerting the force, and #¥ the object on which the force is exerted. C. [5 pts] In the space below, draw a free-body diagram for the bottom brick (#6). Again, label each of the forces to identify: ¥the type of force (e.g., Again, label each of the forces to identify: ¥the type of force (e....
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This document was uploaded on 10/29/2011 for the course PHYS 115 at University of Washington.

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Phys 115 Exam#4 - þ7#Ð##V#°#V#°###§#6#§Ç#f#ª#ª#ª#h#ªñ#R#«C##«Å#«Å#«Ù#x#¨#¬Q#¬q#¬#¬±#x##f#Physics 115B(Winter

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