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 f eld. During this displacement: .............................................................................................. . . . . . . . . . . . . . . . . . . n E •• i f A. the work done by the f eld is positive and the potential energy of the electron- f eld system increases B. the work done by the f eld is negative and the potential energy of the electron- f eld system increases C. the work done by the f eld is positive and the potential energy of the electron- f eld system decreases D. the work done by the f eld is negative and the potential energy of the electron- f eld system decreases E. the work done by the f eld is positive and the potential energy of the electron- f eld system does not change ans: B 2. A particle with a charge of 5 . 5 × 10 8C 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 f nite separation, is: A. 3 . 2 × 10 4 J B. 3 . 2 × 10 4 J C. 9 . 3 × 10 3 J D. 9 . 3 × 10 3 J E. zero ans: B 3. A particle with a charge of 5 . 5 × 10 8 Ci s f 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: A. 3 . 1 × 10 3 J B. 3 . 1 × 10 3 J C. 6 . 0 × 10 5 J D. 6 . 0 × 10 5 J E. 0 ans: C 352 Chapter 24: ELECTRIC POTENTIAL
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4. A particle with a charge of 5 . 5 × 10 8 C charge is f 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 . 5 cm on the y axis. The change in the potential energy of the two-particle system is: A. 3 . 2 × 10 4 J B. 3 . 2 × 10 4 J C. 9 . 3 × 10 3 J D. 9 . 3 × 10 3 J E. 0 ans: E 5. Three particles lie on the x axis: particle 1, with a charge of 1 × 10 8 Cisat 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 f 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 f nite separation. Its x coordinate is: A. 13 cm B. 2 . 5cm C. 7 . D. 10 cm E. ans: A 7. Choose the correct statement: A. A proton tends to go from a region of low potential to a region of high potential B. The potential of a negatively charged conductor must be negative C. If n E = 0 at a point P then V must be zero at P D. If V = 0 at a point P then n E must be zero at P E. None of the above are correct ans: E 8. If 500 J of work are required to carry a charged particle between two points with a potential di f erence of 20 V, the magnitude of the charge on the particle is: A. 0 . 040 C B. 12 .
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This note was uploaded on 04/14/2008 for the course PHYSICS 108 taught by Professor Halstead during the Spring '08 term at SUNY Buffalo.

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

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