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Quiz2a - Exam Name MULTIPLE CHOICE Choose the one...

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Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) An electron (charge -1.6 ˛ 10 -19 C) moves on a path perpendicular to the direction of a uniform electric field of strength 3.0 N/C. How much work is done on the electron as it moves 15 cm? A) 4.8 ˛ 10 -20 J B) -4.8 ˛ 10 -20 J C) 1.68 ˛ 10 -20 J D) -1.6 ˛ 10 -20 J E) zero 1) 2) If an electron is accelerated from rest through a potential difference of 1 200 V, find its approximate velocity at the end of this process. (e = 1.6 ˛ 10 -19 C; me = 9.1 ˛ 10 -31 kg) A) 1.0 ˛ 10 7 m/s B) 1.4 ˛ 10 7 m/s C) 1.8 ˛ 10 7 m/s D) 2.1 ˛ 10 7 m/s E) 2.5 ˛ 10 7 m/s 2) 3) If the distance between two negative point charges is increased by a factor of three, the resultant potential energy is what factor times the initial potential energy? 3)
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