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Exam 2 - 05 - Solutions

# Exam 2 - 05 - Solutions - Physics 152 Practice Exam...

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Physics 152 Practice Exam - 2005 (from Prof. Donoghue, 2005. This was designed as a practice exam, not as a real exam.) The answers are given on the last page. 1. A rod of 2.0-m length and a square (2.0 mm × 2.0 mm) cross section is made of a material with a resistivity of 6.0 × 10 –8 Ω m. If a potential difference of 0.50 V is placed across the ends of the rod, at what rate is heat generated in the rod? a. 3.0 W b. 5.3 W c. 8.3 W d. 1.3 W e. 17 W 2. The electron density in copper is 3 28 m / electrons 10 49 . 8 × . The electron charge is C 10 60 . 1 19 × = e . When a 1.00 A current is present in a copper wire with a 0.40 cm 2 cross-section, the electron drift velocity, in m/s, with direction defined relative to the current density, is a. 6 10 84 . 1 × . b. 6 10 84 . 1 × + . c. 84 . 1 . d. 5 10 43 . 5 × . e. 5 10 43 . 5 × + . 3. A light bulb is rated at 30 W when operated at 120 V. How much charge enters (and leaves) the light bulb in 1.0 min? a. 17 C b. 15 C c. 14 C d. 13 C e. 60 C

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4. What is the current in the 10- Ω resistor ? + 21 V 10 Ω 5 Ω 5 Ω 5 Ω a. 0.60 A b. 3.0 A c. 1.2 A d. 2.4 A e. 0.30 A 5. If I = 0.40 A in the circuit segment shown below, what is the potential difference V a V b ?
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Exam 2 - 05 - Solutions - Physics 152 Practice Exam...

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