Quiz3-1Bb_w_solns

# Quiz3-1Bb_w_solns - Department of Physics UCSD Winter 2009...

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Department of Physics, UCSD Winter 2009 – Physics 1B(b) Prof. Dimitri Basov Quiz 3, February 13 (Version A) 1. If 3 . 25 × 10 - 3 kg of gold are deposited on the negative electrode of an electrolytic cell in a period of 2.78 hours, what is the current through the cell in this period? Assume that the gold ions carry one elementary unit of positive charge each. (The standard atomic weight of gold is 196.97 g/mol and the charge of the electron is - 1 . 6 × 10 - 19 C.) (a) 159 mA (b) 318 mA (c) 9 . 53 A (d) 280 . 74 A (e) 571 . 97 A 2. A rectangular block of copper has sides of length 10 cm, 20 cm, and 40 cm. If the block is connected to a 6.0-V source across opposite faces of the rectangular block, what are the minimum and maximum currents that can be carried? (The resistivity of copper is 1 . 72 × 10 - 8 Ω · m) (a) I min = 1 . 74 × 10 7 A and I max = 2 . 79 × 10 7 A (b) I min = 1 . 74 × 10 7 A and I max = 2 . 79 × 10 8 A (c) I min = 1 . 74 × 10 8 A and I max = 2 . 79 × 10 8 A (d) I min = 1 . 74 × 10 8 A and I max = 2 . 79 × 10 9 A (e) I min = 1 . 74 × 10 9 A and I max = 2 . 79 × 10 9 A 3. A small motor draws a current of 1.75 A from a 120-V line. The output power of the

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Unformatted text preview: motor is 0.20 hp. At a rate of \$0.060/kWh, what is the cost of operating the motor for 4.0 hours? (1 hp = 735 . 49875 W) (a) 1.5 cents (b) 2.5 cents 1 (c) 3.5 cents (d) 5.0 cents (e) 6.5 cents 4. Find the values of I 1 , I 2 and I 3 for the circuit in the ±gure. (a) I 1 = 0 , I 2 = 0 . 5 A , I 3 = 0 . 5 A (b) I 1 = 0 . 5 A , I 2 = 1 . 0 A , I 3 = 1 . 5 A (c) I 1 =-. 5 A , I 2 = 1 . 0 A , I 3 = 0 . 5 A (d) I 1 = 0 . 5 A , I 2 =-1 . 0 A , I 3 =-. 5 A (e) I 1 = 0 . 5 A , I 2 =-. 5 A , I 3 = 0 5. Calculate the equivalent resistance of the cir-cuit in the ±gure. (a) 8 Ω (b) 10 Ω (c) 12 Ω (d) 14 Ω (e) 16 Ω 6. A series RC circuit has a time constant of 0.960 s. The battery has an emf of 48.0 V, and the maximum current in the circuit is 0.500 mA. What is the value of the capacitance? (a) 100 mF (b) 10 mF (c) 1 mF (d) 100 μ F (e) 10 μ F Good luck! 2...
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