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Unformatted text preview: PRINT Your Name: _______________________ Instructor:__________________ Louisiana State University Physics 2102, Exam 2, March 5th, 2009. Please be sure to PRINT your name and class instructor above. The test consists of 4 questions (multiple choice), and 4 problems (numerical). For the problems: Show your reasoning and your work. Note that in many of the problems, you can do parts (b) or (c) even if you get stuck on (a) or (b). You may use scientific or graphing calculators, but you must derive and explain your answer fully on paper so we can grade your work. Feel free to detach, use, and keep the formula sheet pages. No other reference material is allowed during the exam. May The Force Be With You! Question 1 [8 points] A parallel plate capacitor has a dielectric material of dielectric constant > 1 between the plates. The capacitor is charged by first connecting it to a 12 V battery and then disconnecting it from the battery. After it is disconnected, the dielectric is pulled out. Compared to before the dielectric is removed, what happens after it is removed? (Circle the correct answer for each part.) (i) The electric potential across the capacitor: decreases stays the same increases (ii) The charge on the capacitor: decreases stays the same increases (iii) The capacitance: decreases stays the same increases (iv) The potential energy stored in the capacitor: decreases stays the same Question 1 [8 points] A parallel plate capacitor has a dielectric material of dielectric constant > 1 between the plates. The capacitor is charged by first connecting it to a 12 V battery and then disconnecting it from the battery. After it is disconnected, the dielectric is pulled out. Compared to before the dielectric is removed, what happens after it is removed? (Circle the correct answer for each part.) (i) The electric potential across the capacitor: decreases stays the same increases (ii) The charge on the capacitor: decreases stays the same increases (iii) The capacitance: decreases stays the same increases (iv) The potential energy stored in the capacitor: decreases stays the same increases Problem 1 [18 points] Consider the circuit in the figure below. The capacitors have capacitance values C 1 = 0.75 pF, C 2 = 0.50 pF, and C 3 = 1.00 pF. The battery voltage is 12 V....
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 Fall '08
 GIMMNACO
 Physics

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