practice_prelim2__from_F06_

# practice_prelim2__from_F06_ - Physics 213 Your Name:...

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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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## practice_prelim2__from_F06_ - Physics 213 Your Name:...

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