1. To charge a 1-F capacitor with 2 C requires a potential difference of:
 A. 2 V
 B. 0.2 V
 C. 5 V
 D. 0.5 V
 E. none of these

2. The capacitance of a parallel-plate capacitor can be increased by:
 A. increasing the charge
 B. decreasing the charge
 C. increasing the plate separation
 D. decreasing the plate separation
 E. decreasing the plate area

3. The capacitance of a spherical capacitor with inner radius a and outer radius b is proportional to:
 A. a/b
 B. b – a
 C. b2 – a2
 D. ab/(b – a)
 E. ab/(b2 – a2)

4. A 2-mF and a 1-mF capacitor are connected in series and charged from a battery. They store charges P and Q, respectively. When disconnected and charged separately using the same battery, they have charges R and S, respectively. Then:
 A. R > S > Q = P
 B. P > Q > R = S
 C. R > P = Q > S
 D. R = P > S = Q
 E. R > P > S = Q

5. A 20-F capacitor is charged to 200 V. Its stored energy is:
 A. 4000 J
 B. 4 J
 C. 0.4 J
 D. 2000 J
 E. 0.1 J

6.

The diagram shows six 6-mF capacitors. The capacitance between points a and b is:

 A. 3 mF
 B. 4 mF
 C. 6 mF
 D. 9 mF
 E. 1 mF

7. If the charge on a parallel-plate capacitor is doubled:
 A. the capacitance is halved
 B. the capacitance is doubled
 C. the electric field is halved
 D. the electric field is doubled
 E. the surface charge density is not changed on either plate

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