pe17f08 - Last updated: September 26, 2008 PHY 2054...

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Last updated: September 26, 2008 PHY 2054 Discussion – Fall ‘08 Practice Exam Problems (Chapter 17) 1. In a certain material there is a current of 16 A flowing through a surface to the right, and there is an equal amount of positive and negative charge passing through the surface producing the current. How much negative charge passes through the surface? (Electric Current) a. 8 C/s toward the right b. 8 C/s toward the left c. 16 C/s toward the right d. 16 C/s toward the left 2. If a metallic wire of cross sectional area 3.0 × 10 -6 m ² carries a current of 6.0 A and has a mobile charge (free electron) density of 4.24 × 10 28 carriers/m 3 , what is the average drift velocity of the mobile charge carriers? (Drift Speed) a. 3.4 × 10 3 m/s b. 1.7 × 10 3 m/s c. 1.5 × 10 -4 m/s d. 2.9 × 10 -4 m/s 3. The unit of electric resistance, the ohm, is equivalent to which of the following? (Resistance) a. V/A b. V   m c. A/s d. A/m 4. A flashlight bulb operating at a voltage of 4.5 V has a resistance of 8.0
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pe17f08 - Last updated: September 26, 2008 PHY 2054...

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