# ch24 - Chapter 24 ELECTRIC POTENTIAL 1 An electron moves...

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Chapter 24: ELECTRIC POTENTIAL 1. An electron moves from point i to point f , in the direction of a uniform electric fi eld. During this displacement: . . . . . n E i f A. the work done by the fi eld is positive and the potential energy of the electron- fi eld system increases B. the work done by the fi eld is negative and the potential energy of the electron- fi eld system increases C. the work done by the fi eld is positive and the potential energy of the electron- fi eld system decreases D. the work done by the fi eld is negative and the potential energy of the electron- fi eld system decreases E. the work done by the fi eld is positive and the potential energy of the electron- fi eld system does not change ans: B 2. A particle with a charge of 5 . 5 × 10 8 C is 3 . 5 cm from a particle with a charge of 2 . 3 × 10 8 C. The potential energy of this two-particle system, relative to the potential energy at in fi nite separation, is: 3. A particle with a charge of 5 . 5 × 10 8 C is fi xed at the origin. A particle with a charge of 2 . 3 × 10 8 C is moved from x = 3 . 5 cm on the x axis to y = 4 . 3 cm on the y axis. The change in potential energy of the two-particle system is: 352 Chapter 24: ELECTRIC POTENTIAL

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4. A particle with a charge of 5 . 5 × 10 8 C charge is fi xed at the origin. A particle with a charge of 2 . 3 × 10 8 C charge is moved from x = 3 . 5 cm on the x axis to y = 3 . 5 cm on the y axis. The change in the potential energy of the two-particle system is: 5. Three particles lie on the x axis: particle 1, with a charge of 1 × 10 8 C is at x = 1 cm, particle 2, with a charge of 2 × 10 8 C, is at x = 2 cm, and particle 3, with a charge of 3 × 10 8 C, is at x = 3 cm. The potential energy of this arrangement, relative to the potential energy for in fi nite separation, is: A. +4 . 9 × 10 4 J B. 4 . 9 × 10 4 J C. +8 . 5 × 10 4 J D. 8 . 5 × 10 4 J E. zero ans: B 6. Two identical particles, each with charge q , are placed on the x axis, one at the origin and the other at x = 5 cm. A third particle, with charge q , is placed on the x axis so the potential energy of the three-particle system is the same as the potential energy at in fi nite separation. Its x coordinate is: A. 13 cm B. 2 . 5 cm C. 7 . 5 cm D. 10 cm E. 5 cm ans: A
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