208M_answers_practice_test2

208M_answers_practice_test2 - Answer Problems 1 through 3...

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Unformatted text preview: Answer Problems 1 through 3 directly on the test page, not in the blue book. Problem 1 (15 pts) 1 2 In the simple circuit shown above, wire 1 and wire 2 have the same cross sectional area and electron density, but wire 1 has mobility that is 4 times that of wire 2. (a, 5 pts) How does the drift speed ¯ v 1 of electrons in wire 1 compare to the drift speed ¯ v 2 of electrons in wire 2? A. ¯ v 1 = ¯ v 2 B. ¯ v 1 = 4¯ v 2 C. ¯ v 1 = 0 . 25¯ v 2 D. None of these (b, 5 pts) Wire 1 has a mobility of 4 . 5 × 10 − 3 (m/s)/(N/C), an electron density of 8 . × 10 28 per cubic meter, and a cross sectional area of 7 . × 10 − 7 m 2 . You measure the conventional current in wire 1 to be 0.3 amperes. What is the electron drift speed in wire 1? Circle your answer below. A. 9 . 5 × 10 7 m/s B. 1 . 3 × 10 − 4 m/s C. 5 . 4 × 10 − 24 m/s D. 3 . 3 × 10 − 5 m/s E. 8 . 4 × 10 − 6 m/s (c, 5 pts) Circle “T” next to each true statement or “F” for every false statement below regarding...
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This note was uploaded on 01/17/2011 for the course PY 208M taught by Professor Chabay during the Fall '08 term at N.C. State.

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208M_answers_practice_test2 - Answer Problems 1 through 3...

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