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Unformatted text preview: huang (jwh2377) – Homework 2 – lang – (58650) 1 This printout should have 55 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Calculate the net charge on a substance con sisting of a combination of 3 . 8 × 10 13 protons and 5 . × 10 13 electrons. Answer in units of C. 002 10.0 points You have 2 . 2 kg of water. One mole of water has a mass of 18 g / mol and each molecule of water contains 10 electrons since water is H 2 O. What is the total electron charge contained in this volume of water? Answer in units of C. 003 10.0 points A particle with charge 2 μ C is located on the xaxis at the point 8 cm , and a second particle with charge − 6 μ C is placed on the xaxis at − 10 cm . The Coulomb constant is 8 . 9875 × 10 9 N · m 2 / C 2 . 2 4 6 8 10 − 2 − 4 − 6 − 8 − 10 2 μ C − 6 μ C 8 μ C x → (cm) What is the magnitude of the total elec trostatic force on a third particle with charge 8 μ C placed on the xaxis at − 2 cm ? Answer in units of N. 004 10.0 points Two charges q 1 and q 2 are separated by a distance d and exert a force F on each other. What is the new force F ′ , if charge 1 is increased to q ′ 1 = 5 q 1 , charge 2 is decreased to q ′ 2 = q 2 / 2, and the distance is decreased to d ′ = d/ 2? Choose one 1. F ′ = 10 F 2. F ′ = 50 F 3. F ′ = 5 / 2 F 4. F ′ = 25 F 5. F ′ = 25 / 2 F 6. F ′ = 5 F 7. F ′ = 100 F 8. F ′ = 20 F 9. F ′ = 25 / 4 F 10. F ′ = 5 / 4 F 005 (part 1 of 5) 10.0 points Two charges q 1 and q 2 are separated by a distance d and exert a force F on each other. What new force F ′ would exist if q 1 is tripled? 1. F ′ = 0 2. F ′ = 1 3 F 3. F ′ = 1 9 F 4. F ′ = 9 F 5. F ′ = 3 F 6. None of these 006 (part 2 of 5) 10.0 points What new force F ′ would exist if q 1 and q 2 are cut in half? 1. F ′ = 0 2. F ′ = 1 2 F 3. F ′ = 4 F 4. F ′ = 2 F 5. None of these. huang (jwh2377) – Homework 2 – lang – (58650) 2 6. F ′ = 1 4 F 007 (part 3 of 5) 10.0 points What new force F ′ would exist if d is doubled? 1. F ′ = 4 F 2. F ′ = 1 4 F 3. F ′ = 1 2 F 4. None of these 5. F ′ = 0 6. F ′ = 2 F 008 (part 4 of 5) 10.0 points What new force F ′ would exist if d is cut in half? 1. F ′ = 1 4 F 2. None of these. 3. F ′ = 1 2 F 4. F ′ = 4 F 5. F ′ = 2 F 6. F ′ = 0 009 (part 5 of 5) 10.0 points What new force F ′ would exist if q 1 is doubled and d is quadrupled? 1. F ′ = 16 256 F 2. F ′ = 256 4 F 3. F ′ = 256 16 F 4. F ′ = 16 2 F 5. F ′ = 4 256 F 6. F ′ = 0 7. F ′ = 2 16 F 8. None of these. 010 10.0 points Two electrons in an atom are separated by 1 . 6 × 10 − 10 m, the typical size of an atom....
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 Spring '10
 LANG
 Charge, Electrostatics, Work, Electric charge

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