P213Prelim2Fall2007Answers

P213Prelim2Fall2007Answers - Physics 213 SOLUTIONS KEY FOR...

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Unformatted text preview: Physics 213 SOLUTIONS KEY FOR PRELIM #2 (11/06/07) Fall 2007 1. [10 points] (a) F (b) F (c) F (d) F (e) F (f) F (g) T (h) F (j) T (k) T 2. [9 points] (a) D (b) E (c) D 3. [10 points] (a) B (b) B (c) B (d) A (e) B 4. [3 points] Answer: C 5. [6 points] (a) (3 points) Not lit: 4, 5. Dimmest Æ brightest: 2 = 3 < 1 (b) (3 points) Not lit: 5. Dimmest Æ brightest: 2 = 3 = 4 < 1 6. [8 points] (a) (4 points) Answer: B (CH2) (b) (4 points) Capacitance = 0.2 μ F = 2.0 × 10-7 F From graph, τ = 0.4 ms τ = RC ⇒ C = τ R = 0.4 ms 2.0 k Ω = 0.2 μ F = 2.0 × 10-7 F 2 7. [22 points] (a) (4 points) (b) (9 points) Answer: E(r) = -Q 2 π ε o L r (- sign is optional here.) Construct a cylindrical Gaussian bubble with radius r, then apply Gauss' law: Φ E = Qencl ε o ⇒ E(r) 2 π rL = -Q ε o ⇒ E(r) = -Q 2 π ε o L r- sign indicates that field points inward. (c) (5 points) Answer: V inner- V outer = ‐ ⎝ ⎜ ⎜ ⎛ ⎠ ⎟ ⎟ ⎞ Q 2 π ε o L ln(b/a) V inner- V outer = V(a) ‐ V(b) = ‐...
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P213Prelim2Fall2007Answers - Physics 213 SOLUTIONS KEY FOR...

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