1. If 500 J of work are required to carry a 40-C charge from one point to another, the potential difference between these two points is:
A.12.5 V
B.20,000 V
C.0.08 V
D.depends on the path
E.none of these


2. During a lightning discharge, 30 C of charge move through a potential difference of 1.0 × 108 V in 2.0 × 10–2 s. The energy released by this lightning bolt is:
A.1.5 × 1011 J
B.3.0 × 109 J
C.6.0 × 107 J
D.3.3 × 106 J
E.1500 J


3.

In the diagram, the points 1, 2, and 3 are all the same very large distance from a dipole. Rank the points according to the values of the electric potential at them, from the most negative to the most positive.




A.1, 2, 3
B.3, 2, 1
C.2, 3, 1
D.1, 3, 2
E.1 and 2 tie, then 3


4. An electron has charge –e and mass me. A proton has charge e and mass 1840me. A "proton volt" is equal to:
A.1eV
B.1840eV
C.(1/1840)eV
D.
E.


5. Two identical charges q are placed on the x axis, one at the origin and the other at x = 5 cm. A third charge –q is placed on the x axis so the potential energy of the three-charge system is the same as the potential energy at infinite separation. Its x coordinate is:
A.13 cm
B.2.5 cm
C.7.5 cm
D.10 cm
E.–5 cm


6. Positive charge is distributed uniformly throughout a non-conducting sphere. The highest electric potential occurs:
A.at the center
B.at the surface
C.halfway between the center and surface
D.just outside the surface
E.far from the sphere


7. 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


8.

Each of the three 25-mF capacitors shown is initially uncharged. How many coulombs of charge pass through the ammeter A after the switch S is closed?




A.0.10
B.0.30
C.10
D.0.033
E.none of these


9. The quantity (1/2)50E2 has the significance of:
A.energy/farad
B.energy/coulomb
C.energy
D.energy/volume
E.energy/volt


10. The capacitance of a parallel-plate capacitor with plate area A and plate separation d is given by:
A.50d/A
B.50d/2A
C.50A/d
D.50A/2d
E.5d/50


11. A parallel-plate capacitor has a plate area of 0.2 m2 and a plate separation of 0.1 mm. If the charge on each plate has a magnitude of 4 × 10–6 C the potential difference across the plates is approximately:
A.0
B.4 × 10–2 V
C.1 × 102 V
D.2 × 102 V
E.4 × 108 V


12. Two identical capacitors, each with capacitance C, are connected in parallel and the combination is connected in series to a third identical capacitor. The equivalent capacitance of this arrangement is:
A.2C/3
B.C
C.3C/2
D.2C
E.3C


13. Capacitors A and B are identical. Capacitor A is charged so it stores 4 J of energy and capacitor B is uncharged. The capacitors are then connected in parallel. The total stored energy in the capacitors is now:
A.16 J
B.8 J
C.4 J
D.2 J
E.1 J


14. 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


15. A 2-mF and a 1-mF capacitor are connected in series and a potential difference is applied across the combination. The 2-mF capacitor has:
A.twice the charge of the 1-mF capacitor
B.half the charge of the 1-mF capacitor
C.twice the potential difference of the 1-mF capacitor
D.half the potential difference of the 1-mF capacitor
E.none of the above



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