rev15sp09 - January 15, 2009 PHY 2054 Discussion Spring 09...

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January 15, 2009 PHY 2054 Discussion Spring ‘09 Conceptual Review: Chapter 15 A . Coulomb Force 1. Two Coulomb forces are exerted on a charged object and they are in different directions. How do you calculate the net force on the object? 2. I expect the net force in the previous question to be in the 2 nd quadrant. But my calculator shows it is in the 4 th quadrant. What should I do? B. Electric Field 1. Does electric field change direction if you change the sign of a test charge? 2. Two positive charges are aligned on a line. Can the electric field be zero between the two charges? Explain. 3. Two charges are aligned on a line. One is positive and the other one is negative. Can the electric field be zero between the two charges? Explain. C. Electric Flux 1. Electric flux for a uniform electric field is = EAcos Ф θ . θ is the the angle of the field with respect to: 2. For a closed surface, is the normal taken to be outside or inside of the surface? D. Gauss’s Law
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rev15sp09 - January 15, 2009 PHY 2054 Discussion Spring 09...

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