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Name: __________________________ Date: _____________ 1. Capacitors C1 and C2 are connected in parallel and a potential difference is applied to the combination. If the capacitor that is equivalent to the combination has the same potential difference, then the charge on the equivalent capacitor is the same as: A) the charge on C1 B) the sum of the charges on C1 and C2 C) the difference of the charges on C1 and C2 D) the product of the charges on C1 and C2 E) none of the above 2. If both the plate area and the plate separation of a parallel-plate capacitor are doubled, the capacitance is: A) doubled B) halved C) unchanged D) tripled E) quadrupled 3. A 2-μF and a 1-μF capacitor are connected in series and charged by a battery. They store energies P and Q, respectively. When disconnected and charged separately using the same battery, they have energies R and S, respectively. Then: A) R > P > S > Q B) P > Q > R > S C) R > P > Q > S D) P > R > S > Q E) R > S > Q > P 4. A 10-ohm resistor has a constant current. If 1200 C of charge flow through it in 4 minutes what is the vlaue of the current? A) 3.0 A B) 5.0 A C) 11 A D) 15 A E) 20 A Page 1 5. A current of 0.5 ampere exists in a 60-ohm lamp. The applied potential difference is: A) 15 V B) 30 V C) 60 V D) 120 V E) none of these 6. A student kept her 60 watt 120 volt study lamp turned on from 2 PM until 2 AM. How many coulombs went through it? A) 150 B) 3,600 C) 7,200 D) 9,000 E) 18,000 7. A total resistance of 3.0 Ω is to be produced by combining an unknown resistor R with a 12 Ω resistor. What is the value of R and how is it to be connected to the 12 Ω resistor? A) 4.0 Ω, parallel B) 4.0 Ω, series C) 2.4 Ω, parallel D) 2.4 Ω, series E) 9.0 Ω, series 8. Resistances of 2.0 Ω, 4.0 Ω, and 6.0 Ω and a 24-V battery are all in series. The current in the 2.0 Ω resistor is: A) 12 A B) 4.0 A C) 2.4 A D) 2.0 A E) 0.50 A Page 2 9. In the figure, voltmeter V1 reads 600 V, voltmeter V2 reads 580 V, and ammeter A reads 100 A. The power wasted in the transmission line connecting the power house to the consumer is: A) B) C) D) E) 1 kW 2 kW 58 kW 59 kW 60 kW 10. Four circuits have the form shown in the diagram. The capacitor is initially uncharged and the switch S is open. The values of the emf 5, resistance R, and the capacitance C for each of the circuits are circuit 1: 5 = 18 V, R = 3 Ω, C = 1 μF circuit 2: 5 = 18 V, R = 6 Ω, C = 9 μF circuit 3: 5 = 12 V, R = 1 Ω, C = 7 μF circuit 4: 5 = 10 V, R = 5 Ω, C = 7 μF Rank the circuits according to the time after switch S is closed for the capacitors to reach half their final charges, least to greatest. A) 1, 2, 3, 4 B) 4, 3, 2, 1 C) 1, 3, 2, 4 D) 4, 2, 1, 3 E) 3, 1, 2, 4 Page 3 11. A proton (charge e), traveling perpendicular to a magnetic field, experiences the same force as an alpha particle (charge 2e) which is also traveling perpendicular to the same field. The ratio of their speeds, vproton/valpha is: A) 0.5 B) 1 C) 2 D) 4 E) 8 12. A cyclotron operates with a given magnetic field and at a given frequency. If R denotes the radius of the final orbit, the final particle energy is proportional to: A) 1/R B) R C) R2 D) R3 E) R4 13. You are facing a loop of wire which carries a clockwise current of 3.0 A and which surrounds an area of 5.8 10−2m2. The magnetic dipole moment of the loop is: A) 3.0 A ⋅ m2, into the page B) 3.0 A ⋅ m2, out of the page C) 0.17 A ⋅ m2, into the page D) 0.17 A ⋅ m2, out of the page E) 0.17 A ⋅ m2, left to right Page 4 Answer Key 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. B C E D B D A D B C C C C Page 5