inclasstest 02-solutions

# inclasstest 02-solutions - Version 075/ABACD inclasstest 02...

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Version 075/ABACD – inclasstest 02 – turner – (56725) 1 This print-out should have 3 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 3) 10.0 points An electron traveling at 5 × 10 6 m / s enters a 0 . 08 m region with a uniform electric field of 170 N / C , as in the figure. The mass of an electron is 9 . 10939 × 10 - 31 kg and the charge on an electron is 1 . 60218 × 10 - 19 C . - - - - - - - - - 0 . 08 m + + + + + + + + + ˆ ı ˆ 5 × 10 6 m / s Find the magnitude of the acceleration of the electron while in the electric field. 1. 29899900000000.0 2. 20754100000000.0 3. 51709300000000.0 4. 45201700000000.0 5. 24975200000000.0 6. 16708800000000.0 7. 18995300000000.0 8. 36583400000000.0 9. 28844600000000.0 10. 38342300000000.0 Correct answer: 2 . 98999 × 10 13 m / s 2 . Explanation: Let : q e = 1 . 60218 × 10 - 19 C , m e = 9 . 10939 × 10 - 31 kg , and E = 170 N / C . F = ma = q E , so vectora = - q e E m e ˆ = - (1 . 60218 × 10 - 19 C)(170 N / C) 9 . 10939 × 10 - 31 kg ˆ = - (2 . 98999 × 10 13 m / s 2 , and the magnitude of the acceleration of the electron is 2 . 98999 × 10 13 m / s 2 . 002 (part 2 of 3) 10.0 points Find the time it takes the electron to travel through the region of the electric field, assum- ing it doesn’t hit the side walls.

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