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 – 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 = - 2000 V. The distance From A to B is 0 . 21 m. What is the magnitude oF the electric feld in this region? Correct answer: 9523 . 81 V / m. Explanation: We can go through the Following series oF steps to fnd % 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 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. VI 3. IV 4. VIII 5. I 6. V 7. VII correct 8. 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 fgure below.

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-- - - - - - - 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. VIII 2. 3. IV 4. 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 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. VIII 2. correct 3. V 4. 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 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 sup- portsnot shown in the diagram. Each disk has an area of 3 m 2 (this is the area of one ²at 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 Feld (magnitude and direction) in the region between disks 1 and 2? (Since the Feld 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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