2006 Exam 2 & Key

# 2006 Exam 2 &amp; Key - Physics 2220.004 Spring 2006...

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Physics 2220.004 Spring 2006 Examination 2 Name: This test consists of 10 multiple-choice questions and 5 free-response problems, for a total of 110 points (so that 10 points of extra credit are possible). To receive credit for the free-response problems, you must show all of your work on the pages provided. Don’t hand in any extra sheets or other paper. You may also earn partial credit for the some of the multiple choice problems if you show your work. Suggested procedure for solving the problems: 1. Read each problem carefully and make sure you know what is being asked before starting the problem. 2. Draw a figure for the problem. 3. List the parameters given. 4. Write down the equations to be used. 5. Solve for the answer symbolically. 6. Substitute numbers into you final equation and circle your answer. WORK THE EASY PROBLEMS FIRST!!

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1. (5 points) The electric potential inside a charged solid spherical conductor in equilibrium a. is always zero. b. is constant and equal to its value at the surface. c. decreases from its value at the surface to a value of zero at the center. d. increases from its value at the surface to a value at the center that is a multiple of the potential at the surface. e. is equal to the charge passing through the surface per unit time divided by the resistance. 2. (6 points) A parallel plate capacitor of capacitance C 0 has plates of area A with separation d between them. When it is connected to a battery of voltage V 0 , it has a charge of magnitude Q 0 on each of its plates. While it remains connected to the battery the separation between the
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## 2006 Exam 2 &amp; Key - Physics 2220.004 Spring 2006...

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