# Two conductors of equal lengths are connected to a

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9. Two conductors of equal lengths are connected to a battery by ideal wires. The conductors are made of the same material but have different radii. Which of the following statements are correct? 1 2 I. Conductor 1 dissipates more power than Conductor 2 II. Conductor 1 has more current flowing through it than Conductor 2 III. Conductor 1 has a greater potential difference across it than Conductor 2. A. I, II, & III B. II & III C. I only D. I & II E. I & III Page 5

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PHYS 251 - MT2 Sample 1 10. Three identical parallel-plate capacitors have been fully charged by connecting each of them to identical 9-volt batteries. The batteries are then disconnected. After this the plates of the capacitors are moved farther apart or closer together as depicted in the scenarios below. 1 2 3 Rank these capacitors in terms of the charge store in the capacitor, from least to greatest. 11. A proton is placed near a Ca 2+ ion and then released. If the initial acceleration of the protron is 3.06 × 10 10 m/s 2 , how far was the proton from the ion when the proton was released? 12. A wire is 2.57 m long and 1 x 10 -6 m 2 in cross-sectional area. When connected to a potential difference of 2 volts, a current of 8 A exists in the wire. The wire is made of Page 6
PHYS 251 - MT2 Sample 1 13. Two electrons are held 200 nm away from each other and then both are released. How fast is either moving when the distance between them is 300 nm? A. 50,000 m/s B. 36,000 m/s C. 21,000 m/s D. 24,000 m/s E. 29,000 m/s

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