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Unformatted text preview: or D. It induces an equal and opposite charge on the outside surface E. None of the above. 8. A proton is released from rest, close to a metal sphere of radius 10 cm, which is charged to a potential of –150 Volts. Which of the following statements is correct? A. The acceleration of the proton is in the opposite direction as the electric field. B. The potential energy of the proton increases as it moves closer to the sphere. C. The proton follows a path of constant potential. D. The electric field points towards the sphere. E. The electric force is constant along the path of the proton. 9. In the problem above, what is the total charge carried by the sphere? A. −1.67×10 ­9 Coul B. +1.67×10 ­9 Coul C. −15.0 Coul D. +6.00×107 Coul E. −6.00×106 Coul 10. The potential difference between two parallel metal plates (large in comparison to their separation) is maintained at a constant value by connecting them to a battery. If the separation between the plates is doubled while the potential difference is held the same, what happens to the total charge on each of the plates? A. Increases to 1.414 x previous value B. Drops to half its previous value C. Remains the same D. Rises to twice its previous value E. Drops to 70.7% of previous value 75 µF 11. In the drawing to the right, what can you say 410 V about the magnitude of the charge on each of the plates of the two capacitors? A. The charge on the 75µF capacitor is greater. B. The charge on the 25µF capacitor is greater. C. The charges on the two capacitors are equal. 25 µF 12. Referring to the same drawing, what can you say about the energy stored in each capacitor? A. The energy stored in the 75µF capacitor is greater. B. The energy stored in the 25µF capacitor is greater. C. They are equal. 13. A 6.0 V battery powers a 1 Watt flashlight. Which answer is closest to the number of electrons that flow through the light bulb in one second? A. 1.0 x 1020 B. 1.0 x 1018 C. 1.0 x 1023 D. 1.0 x 1017 E. 1.0 x 1019 14. I have a wire which is 1 meter long, and 1 mm in diameter. If I measure the resistance of the wire to be 0.10 Ω, what is the resistivity of the material? A. 1.6 x 10 ­3 Ω m B. 1.3 x 108 Ω m C. 7.9 x 10 ­8 Ω m D. 3.1 x 10 ­7 Ω m E. 7.9 x 10 ­7 Ω m 15. The oscilloscope that recorded this trace was set to 1 msec/division horizontal and 0.1 Volts/division vertical. What is the frequency of the signal that was being measured? A. 1500 Hz B. 70 Hz C. 750 Hz D. 1333 Hz E. 700 Hz...
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