18_InstSolManual_PDF_Part1 - ELECTRIC POTENTIAL AND...

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18-1 E LECTRIC P OTENTIAL AND C APACITANCE 18 Answers to Multiple-Choice Problems 1. A, C 2. C 3. A 4. A, D 5. C 6. B, C 7. B, D 8. C 9. B 10. C 11. D 12. A 13. A 14. A, C 15. C Solutions to Problems 18.1. Set Up: Since the charge is positive the force on it is in the same direction as the electric field. Since the field is uniform the force is constant and Solve: (a) is upward and is to the right, so and (b) is upward and is upward, so (c) is upward and is at below the horizontal, so Reflect: The work is positive when the displacement has a component in the direction of the force and it is negative when the displacement has a component opposite to the direction of the force. When the displacement is perpendicular to the force the work done is zero. 18.2. Set Up: (a) The proton has charge and mass Let point a be at the negative plate and point b be at the positive plate. The electric field is directed from the positive plate toward the negative plate. The force on the positively charged proton is in this direction. The proton moves in a direction opposite to the electric force, so the work done by the electric force is negative.
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