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Exam1_2007

# Exam1_2007 - Name General Physics 114 Test#1 1 A Teflon...

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General Physics 114 Test #1 February 21, 2007 Name_____________________ 1. A Teflon disk is rubbed with a thin nylon sheet, and thereby acquires a net negative charge. An uncharged metal ball is brought close to the Teflon disk. The ball is touched on the opposite side by a grounding wire and then the wire is removed. Which one of the following statements is true? a) The metal ball has now acquired a net positive charge. b) The metal ball has now acquired a net negative charge. c) The metal ball remains neutral. The next 2 questions pertain to the following situation: The electric charges on the two metal plates shown here create a uniform electric field E between the plates. Now we place a negatively charged ball (-q) at the center of this capacitor. This will create a distortion of the field lines as shown. 2. Which plate has positive charge on it? a) The top plate b) The bottom plate c) Both plates d) Neither plate e) Impossible to tell without more tests 3. For the three positions shown (A, B, C), rank the magnitude of the electric field in order from strongest to weakest. a) E A > E B > E C b) E C > E A > E B c) E A > E C > E B d) The fields are all equal 4. A point charge is placed at the center of a spherical Gaussian surface. The net electric flux Φ e through the surface can be changed by: a) replacing the sphere with a cube of the same volume b) replacing the sphere with a cube of one-tenth the volume c) moving the point charge from the center of the sphere, but keeping it inside the sphere d) moving the point charge to just outside the sphere e) adding a second point charge just outside the sphere. 5. Two point charges,

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Exam1_2007 - Name General Physics 114 Test#1 1 A Teflon...

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