# Physics Quiz 4

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1. One coulomb per volt is a
2. Two parallel-plate capacitors are identical in every respect except that one has twice the plate area of the other. If the smaller capacitor has capacitance C, the larger one has capacitance of
2C
3. A parallel-plate capacitor has a capacitance of C. If the area of the plate is doubled and the distance between the plates is halved, what is the new capacitance?
4C
4. A battery charges a parallel-plate capacitor fully and then is removed. The plates are immediately pulled apart. (With the battery disconnected, the amount of charge on the plates remains constant.) What happens to the potential difference between the plates as they are being separated?
It increases.
5. If the electric field between the plates of a given capacitor is weakened, the capacitance of that capacitor
does not change
6. The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they are pulled apart. During this process, the amount of charge on the plates must
decrease
7. The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they are pulled apart. What happens to the strength of the electric field during this process?
It decreases.
8. A dielectric material such as paper is placed between the plates of a capacitor. What happens to the capacitance?
becomes larger
9. A dielectric material such as paper is placed between the plates of a capacitor holding a fixed charge. What happens to the electric field between the plates?
becomes weaker
10. A parallel-plate capacitor is connected to a battery and becomes fully charged. The capacitor is then disconnected, and the separation between the plates is increased in such a way that no charge leaks off. The energy stored in this capacitor has
increased
11. Doubling the capacitance of a capacitor holding a constant charge causes the energy stored in that capacitor to
decrease to one fourth.
12. Doubling the voltage across a given capacitor causes the energy stored in that capacitor to