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# pe16f08 - Last updated PHY 2054 Discussion Fall 08 Practice...

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Last updated: September 16, 2008 PHY 2054 Discussion – Fall ‘08 Practice Exam Problems (Chapter 16) 1. A uniform electric field, with a magnitude of 600 N/C, is directed paralledlt ot the positive x-axis. If the potential at x = 3.0 m is 1 000 V, what is the potential at x = 1.0 m? (Electric Potential) a. 400 V b. 1 600 V c. 2 200 V d. 2 500 V 2. Four point charges are on the rim of a circle of radius 10 cm. The charges are (in μC) +0.50, +1.5, -1.0, -0.50. If the electrical potential at the circle’s center due to the +0.5 charge alone is 4.5 × 10 4 V, what is the total potential at the center due to the four charges combined? (Electric potential due to Point Charges) a. 18 × 10 4 V b. 4.5 × 10 4 V c. zero d. -4.5 × 10 4 V 3. Two point charges of values +3.4 and +6.6 μC, respectively, are separated by 0.20 m. What is the potential energy of this 2-charge system? (Potential Energy due to Point Charges) -0.75 J

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pe16f08 - Last updated PHY 2054 Discussion Fall 08 Practice...

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