Ch17-h2-solutions

# Ch17-h2-solutions - pan (zp695) Ch17-h2 chiu (56565) This...

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pan (zp695) – Ch17-h2 – chiu – (56565) 1 This print-out should have 34 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points Locations A and B are in a region oF uniForm electric feld, as shown in the Following fgure. AB ± E Along a path From B to A ,t h ec h a n g e in potential in Δ V = - 2400 V. The distance From A to B is 0 . 22 m. What is the magnitude oF the electric feld in this region? Correct answer: 10909 . 1V / m. Explanation: We can go through the Following series oF steps to fnd ± E ’s magnitude. Δ V = - ± E · d ± ² = - E x Δ x | Δ V | = | E x || Δ x | | E x | = Δ V Δ x = 2400 V 0 . 22 m = 10909 . / m . Note that V/m is the same as N/C. 002 (part 1 of 2) 10.0 points Consider the fgure below. - - - - - - - - - - + + + + + + + + + + i f What is the direction oF the electric feld? Choose the best answer From the set oF arrows below. I II III IV V VI VII VIII 1. 2. IV 3. VI 4. VII correct 5. V 6. 7. I 8. VIII 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. Positive correct 2. Negative Explanation: Based on the equation Δ V = - ± E · Δ ± ² , we can see that Δ V is positive because the path Δ ± ² is opposite ± E . 004 (part 1 of 2) 10.0 points Consider the fgure below.

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pan (zp695) – Ch17-h2 – chiu – (56565) 2 -- - - - - - - i f What is the direction of the electric Feld along the path from i to f ?Ch o o s eth eb e s t answer from the set of arrows below. I II III IV V VI VII VIII 1. 2. VI correct 3. VII 4. VIII 5. I 6. 7. IV 8. V 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. Negative correct 2. Positive Explanation: Based on the equation Δ V = - ± E · Δ ± ² , we can see that Δ V is negative because the path Δ ± ² and ± E are in the same direction. 006 (part 1 of 2) 10.0 points Consider the Fgure below. - + i f What is the direction of the electric Feld along the path from i to f o o s e s t answer from the set of arrows below. I IV V VI VII VIII 1. VI 2. VIII 3. I 4. correct 5. IV 6. VII 7. 8. V Explanation: ± E is in the + x direction, parallel to the dipole moment.
pan (zp695) – Ch17-h2 – chiu – (56565) 3 007 (part 2 of 2) 10.0 points Is Δ V = V f - V i positive or negative? 1. Negative correct 2. Positive Explanation: Based on the equation Δ V = - ± E · Δ ± ² , we can see that Δ V is negative because the path Δ ± ² 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 Fgure. + + + + + - - - - - - - - - - - - - - - + + + + + + + + + + Disk 1 Disk 2 Disk 3 + Q 1 - Q 1 - Q 2 + Q 2 A BC D ± G 3mm 4mm 1.7 mm 0.02 mm 0.02 mm 0.02 mm The disks are held apart by insulating supports not shown in the diagram. Each disk has an area of 3 .

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## This note was uploaded on 02/21/2012 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas at Austin.

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Ch17-h2-solutions - pan (zp695) Ch17-h2 chiu (56565) This...

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