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Ch17-h2-solutions

# Ch17-h2-solutions - liu(ql744 Ch17-h2 chiu(56565 This...

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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. A B E Along a path from B to A , the change in potential in Δ V = - 2000 V. The distance from A to B is 0 . 21 m. What is the magnitude of the electric field in this region? Correct answer: 9523 . 81 V / m. Explanation: We can go through the following series of steps to find E ’s magnitude. Δ V = - E · d = - E x Δ x | Δ V | = | E x | | Δ x | | E x | = Δ V Δ x = 2000 V 0 . 21 m = 9523 . 81 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. VI 3. IV 4. VIII 5. I 6. V 7. VII correct 8. II Explanation: 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 = - E · Δ , we can see that Δ V is positive because the path Δ is opposite E . 004 (part 1 of 2) 10.0 points Consider the figure below.

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- - - - - - - - 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. VIII 2. II 3. IV 4. III 5. I 6. V 7. VI correct 8. VII Explanation: 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 = - E · Δ , we can see that Δ V is negative because the path Δ and 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. VIII 2. III correct 3. V 4. II 5. VI 6. VII 7. IV 8. I Explanation: E is in the + x direction, parallel to the dipole moment.
007 (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 = - E · Δ , we can see that Δ V is negative because the path Δ and E are in the same direction. 008 (part 1 of 9) 10.0 points Three charged metal disks are arranged as shown in the following figure. + + + + + - - - - - - - - - - - - - - - + + + + + + + + + + Disk 1 Disk 2 Disk 3 + Q 1 - Q 1 - Q 2 + Q 2 A B C D F G 3 mm 4 mm 1.7 mm 0.02 mm 0.02 mm 0.02 mm The disks are held apart by insulating sup- ports not shown in the diagram. Each disk has an area of 3 m 2 (this is the area of one flat sur- face of the disk). The charge Q 1 = 6 × 10 - 8 C and the charge Q 2 = 3 × 10 - 7 C. What is the electric field (magnitude and direction) in the region between disks 1 and 2? (Since the field points along the x axis, the direction will be indicated by the sign of your answer.) Take 0 = 8 . 85 × 10 - 12 C 2 N · m 2 .

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Ch17-h2-solutions - liu(ql744 Ch17-h2 chiu(56565 This...

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