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P213_Prelim_Exam_2_S08_Solutions

# P213_Prelim_Exam_2_S08_Solutions - = 0.20 V t(s Outside...

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Physics 213 Prelim #2 Solutions Spring 2008 1. A 2. B, D [-2 for just one of these, 3. F -2 for additional incorrect answer] 4. (a) F (b) A (c) C 5. (a) E (b) μ o I 4 ± R + μ o I 4R 6. B 7. (a) 8. (a) (b) (b) C eff = 3C ± = RC eff = 3RC (c) V bd = V max e -t/ ± V bd /V max = e -t/ ± = 1/20 ² e -3 -t/ ± = -3 ² t = 3 ± = 9RC 9. (a) A (b) B 1 = B 2 = μ o I 2 ± r B = B 1 cos ³ + B 2 cos ³ = 2 μ o I 2 ± r x r = μ o Ix ± (x 2 + D 2 ) 10. (a) B (b) o ´ B d ± = ³ o I encl (c) E B(r) 2 ± r = ³ o I µ · ¸ ¹ º ± r 2 ± a 2 ² B(r) = ³ o Ir 2 ± a 2 11. (a) I max = V max R = 2.0 V 20 » = 0.10 A (b) (c) B max = ³ o nI max = (4 ± x 10 -7 T-m/A)(500 / 0.10 m)(0.10 A) = 6.3 x 10 -4 T (d) | ¼ | = N ½ ½ ½ ½ ½ ½ d ¾ B dt = N probe A probe ½ ½ ½ ½ ½ ½ dB dt = (100) ± (0.010 m) 2 2(6.3 x 10 -4 T) 0.20 x 10
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Unformatted text preview: = 0.20 V t (s) Outside field region Entering field region Inside field region Leaving field region Outside field region t (s) Outside field region Entering field region Inside field region Leaving field region Outside field region t Switch in position #2 Switch in pos. #1 Switch in position #1 D D I I out of page out of page +x +y ± ± ± ± B 1 B 2 B r r x a P r t (s) Outside field region Entering field region Inside field region Leaving field region Outside field region OR . . ....
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