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midterm_06

# midterm_06 - Physics 7D Midterm Spring 2006 Seat number...

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Physics 7D Midterm Name: Spring 2006 Student ID: Seat number Signature: DO NOT OPEN THIS EXAM BOOKLET UNTIL INSTRUCTED. 1. Leave all backpacks, cell phones, pagers, and other belongings at the front of the room. 2. This exam is 1 hour 20 minutes long, closed book, and closed notes. 3. You may use 1 side of an 8.5” x 11” sheet of handwritten notes. 4. For multiple choice problems, t ransfer all answers to the table below . Credit will be given only for answers in this table. No partial credit will be given. 5. Free response: Partial credit will be given for neatly written, substantial progress if the grader can follow your reasoning and there is an absence of irrelevant or wrong work. 6. The problems vary in difficulty. For free response questions, part (A) is not necessarily required for part (B), etc. Attempt easier problems first. Multiple Choice (3 points) Answer Free Response (10 points) Score 1 b [b] 2 b [e] 3 a [a] 4 c [c] 5 e [b] 6 c [c] 7 d [d] 8 d [b] 9 c [b] 10 d [a] Total MC total 1 2 3

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Multiple Choice Problems-put the letter corresponding to the statement that is most true on the front page 1) Two conducting spheres of radius R and 2R are far apart and connected by a conducting wire. A total charge Q is placed on the system. After some time, the wire is cut. Which of the following are true: a) The electric field at the surfaces of the two spheres is the same. b) The electric potential at the surfaces of the two spheres is the same. c) The charge on the two spheres is the same. d) Two and only two of the above statements are true. 2) Which of the following is the best representation of a plot of the magnitude of the electric field as a function of distance from the axis of a non-conducting cylinder of radius R with constant charge density? R R R R a b c d 3) A uniformly charged insulating disk of radius R has total charge given by Q. Which of the expression below is a correct integral expression for the electric potential a height h above the center of the disk?