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ch24-h2-solutions - pan(zp695 ch24-h2 chiu(56565 This...

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pan (zp695) – ch24-h2 – chiu – (56565) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A proton is briefly accelerated in the - y di- rection, as shown in the figure below. + × × × × A D C B a At which location(s) A—D will electromag- netic radiation be detected a short time later? List all that apply, separated by commas. If none apply, enter “none”. Correct answer: A, B, C. Explanation: The radiative electric field is non-zero at locations A, B, and C. The radiative electric field along the axis of the acceleration (point D) is zero. 002 10.0 points A proton is accelerated in the direction shown by the arrow labeled a in the figure below. r a IV I VI V II III Which of the arrows labeled I-VI shows the direction of the vector a at the observation location indicated by the vector r ? 1. VI correct 2. V 3. II 4. I 5. IV 6. III Explanation: VI is the correct choice. 003 (part 1 of 3) 10.0 points A proton located at the origin is accelerated in the - y direction for a brief time. How much time passes before a detector located at 0 . 85 m , 0 , 0 detects a radiative electric field? Use c = 3 × 10 8 m / s. Correct answer: 2 . 83333 × 10 - 9 s. Explanation: The wave propagates at the speed of light. So c = distance Δ t Δ t = distance c = 0 . 85 m 3 × 10 8 m / s = 2 . 83333 × 10 - 9 s . 004 (part 2 of 3) 10.0 points What is the direction of the radiative electric field observed at this location? Choose the unit vector corresponding to this direction. 1. 0 , 0 , 1 2. 0 , 1 , 0 correct 3. 1 , 0 , 0 4. - 1 , 0 , 0 5. 0 , - 1 , 0 6. 0 , 0 , - 1
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pan (zp695) – ch24-h2 – chiu – (56565) 2 Explanation: For a proton, the radiative electric field is opposite a , which is in the - y direction. Thus, at the given location, E rad is in the + y direction. 005 (part 3 of 3) 10.0 points If the accelerated particle had been an elec- tron instead of a proton, what would have been the direction of the radiative electric field at this location? Choose the unit vector corresponding to this direction. 1. 0 , 1 , 0 2. 1 , 0 , 0 3. 0 , 0 , - 1 4. 0 , 0 , 1 5. - 1 , 0 , 0 6. 0 , - 1 , 0 correct Explanation: For an electron, the radiative electric field is in the same direction as a . Thus, at the given location, E rad is in the - y direction. 006 10.0 points An electric field acts on an electron, resulting in an acceleration of 1 . 2 × 10 17 m / s 2 for a short time. What is the magnitude of the radiative electric field observed at a location a distance of 2 cm away along a perpendicular to the direction of the acceleration? Use the following constants: c = 3 × 10 8 e = 1 . 6 × 10 - 19 k = 1 4 π 0 = 9 × 10 9 N · m 2 / C 2 .
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