5 - Copy (2)

5 - Copy (2) - Version 079/ABADD – inclasstest 03 –...

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Unformatted text preview: Version 079/ABADD – inclasstest 03 – turner – (56705) 1 This print-out should have 2 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points An electron moves at 1 . 2 × 10 6 m / s into a uniform electric field of magnitude 1341 N / C. The charge on an electron is 1 . 60218 × 10- 19 C and the mass of an electron is 9 . 10939 × 10- 31 kg . The field is parallel to the electron’s velocity and acts to decelerate the electron. How far does the electron travel before it is brought to rest? 1. 12.38 2. 2.99638 3. 3.97087 4. 3.66202 5. 5.42791 6. 0.646094 7. 8.24118 8. 4.65188 9. 4.54335 10. 0.305269 Correct answer: 0 . 305269 cm. Explanation: Let : v = 1 . 2 × 10 6 m / s , q e = 1 . 60218 × 10- 19 C , m = 9 . 10939 × 10- 31 kg , and E = 1341 N / C . The kinetic energy K = 1 2 mv 2 is depleted by the amount of work done by the electric force F = q e E on the particle: W = integraldisplay F dx = F x = q e...
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5 - Copy (2) - Version 079/ABADD – inclasstest 03 –...

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