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# chapter18 - 564 CHAPTER 18 ELECTRIC FORCES AND ELECTRIC...

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•• 564 CHAPTER 18 ELECTRIC FORCES AND ELECTRIC FIELDS LEMS Problems that are not marked with a star are considered the easiest to solve. Problems that are marked with a single star (*) are more difficult, whilt those marked with a double star (**) are the most difficult. Note to Instructors: Most ofthe homework problems in this chapter are available for assignment via an online homework management program such as WileyPLUS or WebAssign, and those marked with the icon are presented in WileyPLUS using a guided tutorial format that provides enhanced interactivity. See Preface for additional details. ssm Solution is in the Student Solutions Manual. T This icon represents a biomedical application. _ Solution is available online at www.wiley.comlcollegelcutnell ~~~~~~~~_._-~~~ . '~-"-'-~--~~~'-~~-'"''-''--~~--''''''''~---~''''''''''''' ~~_ .. ~~~-_ ~ ~~~_ _- Section 18.1 The Origin of Electricity, Section 18.2 Charged Objects and the Electric Force, Section 18.3 Conductors and Insulators, Section 18.4 Charging by Contact and by Induction 1. ssm A metal sphere has a charge of +8.0 p,C. What is the net charge after 6.0 X 10 13 electrons have been placed on it? 2. Iron atoms have been detected in the sun's outer atmosphere, some with many of their electrons stripped away. What is the net electric charge (in coulombs) of an iron atom with 26 protons and 7 electrons? Be sure to include the algebraic sign (+ or -) in your answer. 3. Four identical metallic objects carry the following charges: + 1.6, +6.2, -4.8, and -9.4 p,c. The objects are brought simultaneously into contact, so that each touches the others. Then they are separated. (a) What is the final charge on each object? (b) How many elec- trons (or protons) make up the final charge on each object? 4 •• A plate carries a charge of -3.0 j.tC, while a rod carries a charge of +2.0 p,C. How many electrons must be transferred from the plate to the rod, so that both objects have the same charge? 5. ssm Consider three identical metal spheres, A, B, and C. Sphere A carries a charge of +5q. Sphere B carries a charge of -q. Sphere C carries no net charge. Spheres A and B are touched together and then separated. Sphere C is then touched to sphere A and separated from it. Last, sphere C is touched to sphere B and separated from it. (a) How much charge ends up on sphere C? What is the total charge on the three spheres (b) before they are allowed to touch each other and (c) after they have touched? 6 .•Four identical metal spheres have charges of qA = -8.0 j.tC, qB = -2.0 j.tC, qc = +5.0 j.tC, and qD = + 12.0 j.tc. (a) Two of the spheres are brought together so they touch, and then they are sep- arated. Which spheres are they, if the final charge on each one is +5.0 j.tC? (b) In a similar manner, which three spheres are brought together and then separated, if the final charge on each of the three is +3.0 p,C? (c) The final charge on each of the three separated spheres in part (b) is +3.0 p,c. How many electrons would have to

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chapter18 - 564 CHAPTER 18 ELECTRIC FORCES AND ELECTRIC...

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