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2212_Spring2008_Test2_key

2212_Spring2008_Test2_key - PHYS 2212-Sections P and Q Test...

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PHYS 2212-Sections P and Q, Test 2, March 4, 200 Name (print) ---1r-+- _ _=.. CIRCLE ONE: SECTION P (Gole) SECTION Q (Goldman) Instructions • Read all problems carefully before attempting to solve them. Your work must be legible, and the organization must be clear. • Do not write on the back side of pages. Use extra sheets. • You must show all work, including correct vector notation. • Correct answers without adequate explanation will be counted wrong. • Incorrect work or explanations mixed in with correct work will be counted wrong. Cross out anything you don't want us to read! • Make explanations correct but brief. Don't write a lot of prose. • Include diagrams! • Show what goes into a calculation, not just the final number, e.g.: b = (8x 10-:)(5 x 10:) = 5 x 10 4 c·d (2xlO- )(4xlO ) • Give standard 51 units with your results. Unless specifically asked to derive a result, you may start from the formulas given on the formula sheet, inclUding equations corresponding to the fundamental concepts. If a formula you need is not given, you must derive it. If you cannot do some portion of a problem, invent a symbol for the quantity you can't calculate (explain that you are doing this), and use it to do the rest of the problem. Honor pledge "In accordance with the Georgia Tech Honor Code, I have neither given nor received unauthorized aid on this test." Sign your name on the line above

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- - ---+----:+=~q_--x_+_ 15cm: Problem 1 (25 points) I I I I I In the diagram, a thin spherical plastic shell sits with its center (location B in the diagram) at the origin. It has a ra- dius of 7cm and has a uniform positive charge distribution on its surface of +1.2 x 10- 9 C. Below is a thin plastic ring with radius 12 em, and a uniformly distributed charge of -4 x 10- 9 C. It is oriented horizontally and its center (Lo - -.
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