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Unformatted text preview: nguyen (jmn727) oldhomework 05 Turner (59070) 1 This printout should have 8 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points An electron, starting from rest, is accelerated by a uniform electric field of 80000 N / C that extends over a distance of 1 cm. The charge and mass of an electron are 1 . 6 10 19 C and 9 . 11 10 31 kg respectively. Find the speed of the electron after it leaves the region of uniform electric field. Correct answer: 1 . 67633 10 7 m / s. Explanation: Let e = 1 . 6 10 19 C , m e = 9 . 11 10 31 kg , E = 80000 N / C , and x = 1 cm = 0 . 01 m . Because of the constant acceleration, v 2 = v 2 + 2 a x . Since v = 0 and a = F net m e = e E m e , v = radicalbigg 2 e E x m e = radicalBigg 2 (1 . 6 10 19 C) (80000 N / C) 9 . 11 10 31 kg . 01 m = 1 . 67633 10 7 m / s . 002 (part 1 of 3) 10.0 points An electron traveling at 4 10 6 m / s enters a . 1 m region with a uniform electric field of 235 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 . . 1 m + + + + + + + + + 4 10 6 m / s Find the magnitude of the acceleration of the electron while in the electric field. Correct answer: 4 . 13323 10 13 m / s 2 . Explanation: Let : q e = 1 . 60218 10 19 C , m e = 9 . 10939 10 31 kg , and E = 235 N / C ....
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This note was uploaded on 01/21/2010 for the course PHY 303L taught by Professor Turner during the Spring '08 term at University of Texas at Austin.
 Spring '08
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