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practice_prelim2__from_F06_ - Physics 213 Your Name Section...

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Physics 213 Practice Prelim 2 (Actual prelim from Fall ’06) Fall 2007 Your Name: Section Number: Section Instructor: Problem Points Grader Your Score 1 13 2 3 3 2 4 6 5 8 6 6 7 23 8 15 9 12 10 12 TOTAL 100 Instructions : Please write your name, section number, and section instructor at the top. There are 10 problems in this exam. The total number of points is 100. Make sure that your copy is complete (15 numbered pages) before starting. The exam is closed book. No graphing calculators are allowed! The last numbered page of the exam contains formulae that you may find useful. Your answers must be written in the box provided in each problem. If the answers are in numbers, please provide SI units . Show your work for possible partial credit on problems or subproblems that are not multiple choice. Two blank pages are attached at the end of the exam. They may be used for scratch paper, but will not be graded, unless you clearly refer us to some item there.
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Physics 213 Practice Prelim 2 (Actual prelim from Fall ’06) Fall 2007 1. True/False [13 points] Indicate T (True) or F (False) in the space at left for each of the following statements. ____ According to the principle of superposition the electric field from several charges will be the sum of the magnitudes of the fields from each of the charges. ____ When applying Gauss’ law for electric fields, one must consider ONLY the electric field arising from charges contained within the closed Gaussian surface. ____ A positively charged particle in the presence of an electric field will always move along an electric field line. ____ A point charge +Q is surrounded concentrically by an imaginary spherical bubble of radius r . The number of field lines from +Q that emerge through the bubble varies with the bubble’s radius r as as 1/r 2 . ____ When a negative charge is moved in the direction of the electric field, the electric potential at the new position is lower than the potential at the old position. ____ Inside a solid perfect conductor, the electric potential is always zero. ____ Two identical Al plates, thickness t , form a parallel plate capacitor. When the capacitor is connected to a battery, the resulting charges will reside only on the plate surfaces on the outside of the capacitor, as shown at right. ____ The separation D of the plates in the above capacitor is doubled, with the capacitor remaining connected to the battery. The total charge residing on each of the plates remains unchanged. ____ A flashlight battery nearing the end of its useful life differs from a fresh one in having a much smaller emf. ____ The total power dissipated by two 15 W light bulbs will be the same regardless of whether they are connected to a battery in series or in parallel.
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