17-2 - brown(twb493 – Ch17-h2 – chiu –(56565 1 This...

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Unformatted text preview: brown (twb493) – Ch17-h2 – chiu – (56565) 1 This print-out should have 34 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Locations A and B are in a region of uniform electric field, as shown in the following figure. b b A B vector E Along a path from B to A , the change in potential in Δ V = − 2200 V. The distance from A to B is 0 . 28 m. What is the magnitude of the electric field in this region? Correct answer: 7857 . 14 V / m. Explanation: We can go through the following series of steps to find vector E ’s magnitude. Δ V = − vector E · d vector ℓ = − E x Δ x ⇒ | Δ V | = | E x || Δ x | ⇒ | E x | = Δ V Δ x = 2200 V . 28 m = 7857 . 14 V / m . Note that V/m is the same as N/C. 002 (part 1 of 2) 10.0 points Consider the figure below. − − − − − − − − − − + + + + + + + + + + i f What is the direction of the electric field? Choose the best answer from the set of arrows below. I II III IV V VI VII VIII 1. III 2. I 3. VII correct 4. VIII 5. V 6. II 7. VI 8. IV Explanation: vector E is in the − x direction, away from the positively charged plate and toward the nega- tively charged plate. 003 (part 2 of 2) 10.0 points Is Δ V = V f − V i positive or negative? 1. Negative 2. Positive correct Explanation: Based on the equation Δ V = − vector E · Δ vector ℓ, we can see that Δ V is positive because the path Δ vector ℓ is opposite vector E . 004 (part 1 of 2) 10.0 points Consider the figure below. brown (twb493) – Ch17-h2 – chiu – (56565) 2 − − − − − − − − i f What is the direction of the electric field along the path from i to f ? Choose the best answer from the set of arrows below. I II III IV V VI VII VIII 1. VI correct 2. I 3. IV 4. VII 5. VIII 6. II 7. III 8. V Explanation: vector E points toward the sphere (toward nega- tive charge), so it points directly along the path, down and to the left. 005 (part 2 of 2) 10.0 points Is Δ V = V f − V i positive or negative? 1. Positive 2. Negative correct Explanation: Based on the equation Δ V = − vector E · Δ vector ℓ, we can see that Δ V is negative because the path Δ vector ℓ and vector E are in the same direction. 006 (part 1 of 2) 10.0 points Consider the figure below. − + i f What is the direction of the electric field along the path from i to f ? Choose the best answer from the set of arrows below. I II III IV V VI VII VIII 1. I 2. VIII 3. V 4. II 5. IV 6. VI 7. III correct 8. VII Explanation: vector E is in the + x direction, parallel to the dipole moment. brown (twb493) – Ch17-h2 – chiu – (56565) 3 007 (part 2 of 2) 10.0 points Is Δ V = V f − V i positive or negative?...
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This note was uploaded on 12/01/2011 for the course PHY 303L taught by Professor Turner during the Fall '08 term at University of Texas.

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17-2 - brown(twb493 – Ch17-h2 – chiu –(56565 1 This...

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